Linux commands part-7
Youtube
Types of shell
- sh
- bash (Bourne Again Shell)
- zsh
- ksh (Korn Shell)
- csh
Reference: https://www.shiksha.com/online-courses/articles/introduction-to-types-of-shell/
Redirection
> content override the file content, If file is already having the content
>> Will append the content to the existing content in the file
In Both case, if the file is not present it will create a file and write the content to the file
By default echo command prints the output to screen. But if we redirection arrows it can store to files
[opc@new-k8s ~]$ mkdir redirection
[opc@new-k8s ~]$ cd redirection/
[opc@new-k8s redirection]$ pwd
/home/opc/redirection
[opc@new-k8s redirection]$ ll
total 0
[opc@new-k8s redirection]$ echo "hello devops" > hello.txt
[opc@new-k8s redirection]$ ll
total 4
-rw-rw-r--. 1 opc opc 13 Apr 17 14:11 hello.txt
[opc@new-k8s redirection]$ cat hello.txt
hello devops
[opc@new-k8s redirection]$ echo "I am learning devops" > hello.txt
[opc@new-k8s redirection]$ ll
total 4
-rw-rw-r--. 1 opc opc 21 Apr 17 14:11 hello.txt
[opc@new-k8s redirection]$ cat hello.txt
I am learning devops
[opc@new-k8s redirection]$ pwd
/home/opc/redirection
[opc@new-k8s redirection]$ ll
total 0
[opc@new-k8s redirection]$ echo "I eat fruits daily" >> double-arrow.txt
[opc@new-k8s redirection]$ ll
total 4
-rw-rw-r--. 1 opc opc 19 Apr 17 14:13 double-arrow.txt
[opc@new-k8s redirection]$ cat double-arrow.txt
I eat fruits daily
[opc@new-k8s redirection]$ echo "I love banana" >> double-arrow.txt
[opc@new-k8s redirection]$ echo "I also like apples" >> double-arrow.txt
[opc@new-k8s redirection]$ ll
total 4
-rw-rw-r--. 1 opc opc 52 Apr 17 14:13 double-arrow.txt
[opc@new-k8s redirection]$ cat double-arrow.txt
I eat fruits daily
I love banana
I also like apples
wget
wget command is used to dowload some binary or big files eg zip, tar, tar.gz files
[opc@new-k8s ~]$ pwd
/home/opc
[opc@new-k8s ~]$ mkdir wget-examples
[opc@new-k8s ~]$ cd wget-examples/
[opc@new-k8s wget-examples]$ pwd
/home/opc/wget-examples
[opc@new-k8s wget-examples]$ ll
total 0
[opc@new-k8s wget-examples]$ wget https://dlcdn.apache.org/maven/maven-3/3.9.1/binaries/apache-maven-3.9.1-bin.zip
--2023-04-17 13:27:27-- https://dlcdn.apache.org/maven/maven-3/3.9.1/binaries/apache-maven-3.9.1-bin.zip
Resolving dlcdn.apache.org (dlcdn.apache.org)... 151.101.2.132, 2a04:4e42::644
Connecting to dlcdn.apache.org (dlcdn.apache.org)|151.101.2.132|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 9143026 (8.7M) [application/zip]
Saving to: ‘apache-maven-3.9.1-bin.zip’
100%[=========================================================================================================================>] 9,143,026 24.9MB/s in 0.4s
2023-04-17 13:27:28 (24.9 MB/s) - ‘apache-maven-3.9.1-bin.zip’ saved [9143026/9143026]
[opc@new-k8s wget-examples]$ ll
total 8932
-rw-rw-r--. 1 opc opc 9143026 Mar 15 10:00 apache-maven-3.9.1-bin.zip
wget command without showing the progress bar
-q or –quiet –> quit mode, will not show any logs or progress bar
[opc@new-k8s wget-examples]$ wget -q https://dlcdn.apache.org/maven/maven-3/3.9.1/binaries/apache-maven-3.9.1-bin.tar.gz
[opc@new-k8s wget-examples]$ ll -h
total 18M
-rw-rw-r--. 1 opc opc 8.7M Mar 15 10:00 apache-maven-3.9.1-bin.tar.gz
-rw-rw-r--. 1 opc opc 8.8M Mar 15 10:00 apache-maven-3.9.1-bin.zip
curl command to download file
[opc@new-k8s ~]$ mkdir curl-examples
[opc@new-k8s ~]$ cd curl-examples/
[opc@new-k8s curl-examples]$ pwd
/home/opc/curl-examples
[opc@new-k8s curl-examples]$ ll
total 0
[opc@new-k8s curl-examples]$ curl https://dlcdn.apache.org/maven/maven-3/3.9.1/binaries/apache-maven-3.9.1-bin.zip -o apache-maven-3.9.1-bin.zip
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 8928k 100 8928k 0 0 13.4M 0 --:--:-- --:--:-- --:--:-- 13.4M
[opc@new-k8s curl-examples]$ ll
total 8932
-rw-rw-r--. 1 opc opc 9143026 Apr 17 13:35 apache-maven-3.9.1-bin.zip
curl command to download file without showing progress bar
-s or –silent –> Will not show the logs or progress bar
[opc@new-k8s curl-examples]$ curl -s https://dlcdn.apache.org/maven/maven-3/3.9.1/source/apache-maven-3.9.1-src.tar.gz -o apache-maven-3.9.1-src.tar.gz
[opc@new-k8s curl-examples]$ ll -h
total 12M
-rw-rw-r--. 1 opc opc 8.8M Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2.7M Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
How to unzip the zip file
By default unzip command will unzip the zip package to the current directory
[opc@new-k8s curl-examples]$ ll
total 11652
-rw-rw-r--. 1 opc opc 9143026 Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2784624 Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
[opc@new-k8s curl-examples]$ pwd
/home/opc/curl-examples
[opc@new-k8s curl-examples]$ unzip apache-maven-3.9.1-bin.zip
Archive: apache-maven-3.9.1-bin.zip
creating: apache-maven-3.9.1/
creating: apache-maven-3.9.1/lib/
creating: apache-maven-3.9.1/boot/
creating: apache-maven-3.9.1/lib/jansi-native/
creating: apache-maven-3.9.1/lib/jansi-native/Windows/
creating: apache-maven-3.9.1/lib/jansi-native/Windows/x86/
creating: apache-maven-3.9.1/lib/jansi-native/Windows/x86_64/
creating: apache-maven-3.9.1/bin/
creating: apache-maven-3.9.1/conf/
creating: apache-maven-3.9.1/conf/logging/
creating: apache-maven-3.9.1/lib/ext/
creating: apache-maven-3.9.1/lib/ext/hazelcast/
creating: apache-maven-3.9.1/lib/ext/redisson/
inflating: apache-maven-3.9.1/README.txt
inflating: apache-maven-3.9.1/LICENSE
inflating: apache-maven-3.9.1/NOTICE
inflating: apache-maven-3.9.1/lib/aopalliance.license
inflating: apache-maven-3.9.1/lib/commons-cli.license
inflating: apache-maven-3.9.1/lib/commons-codec.license
inflating: apache-maven-3.9.1/lib/commons-lang3.license
inflating: apache-maven-3.9.1/lib/failureaccess.license
inflating: apache-maven-3.9.1/lib/guava.license
inflating: apache-maven-3.9.1/lib/guice.license
inflating: apache-maven-3.9.1/lib/httpclient.license
inflating: apache-maven-3.9.1/lib/httpcore.license
inflating: apache-maven-3.9.1/lib/jansi.license
inflating: apache-maven-3.9.1/lib/javax.annotation-api.license
inflating: apache-maven-3.9.1/lib/javax.inject.license
inflating: apache-maven-3.9.1/lib/jcl-over-slf4j.license
inflating: apache-maven-3.9.1/lib/org.eclipse.sisu.inject.license
inflating: apache-maven-3.9.1/lib/org.eclipse.sisu.plexus.license
inflating: apache-maven-3.9.1/lib/plexus-cipher.license
inflating: apache-maven-3.9.1/lib/plexus-component-annotations.license
inflating: apache-maven-3.9.1/lib/plexus-interpolation.license
inflating: apache-maven-3.9.1/lib/plexus-sec-dispatcher.license
inflating: apache-maven-3.9.1/lib/plexus-utils.license
inflating: apache-maven-3.9.1/lib/slf4j-api.license
inflating: apache-maven-3.9.1/boot/plexus-classworlds.license
inflating: apache-maven-3.9.1/lib/jansi-native/Windows/x86/jansi.dll
inflating: apache-maven-3.9.1/lib/jansi-native/Windows/x86_64/jansi.dll
inflating: apache-maven-3.9.1/bin/m2.conf
inflating: apache-maven-3.9.1/bin/mvn.cmd
inflating: apache-maven-3.9.1/bin/mvnDebug.cmd
inflating: apache-maven-3.9.1/bin/mvn
inflating: apache-maven-3.9.1/bin/mvnDebug
inflating: apache-maven-3.9.1/bin/mvnyjp
inflating: apache-maven-3.9.1/conf/logging/simplelogger.properties
inflating: apache-maven-3.9.1/conf/settings.xml
inflating: apache-maven-3.9.1/conf/toolchains.xml
inflating: apache-maven-3.9.1/lib/ext/README.txt
inflating: apache-maven-3.9.1/lib/ext/hazelcast/README.txt
inflating: apache-maven-3.9.1/lib/ext/redisson/README.txt
inflating: apache-maven-3.9.1/lib/jansi-native/README.txt
inflating: apache-maven-3.9.1/boot/plexus-classworlds-2.6.0.jar
inflating: apache-maven-3.9.1/lib/maven-embedder-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-settings-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-settings-builder-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-plugin-api-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-model-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-model-builder-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-builder-support-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-api-1.9.7.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-util-1.9.7.jar
inflating: apache-maven-3.9.1/lib/maven-shared-utils-3.3.4.jar
inflating: apache-maven-3.9.1/lib/guice-5.1.0.jar
inflating: apache-maven-3.9.1/lib/aopalliance-1.0.jar
inflating: apache-maven-3.9.1/lib/guava-30.1-jre.jar
inflating: apache-maven-3.9.1/lib/failureaccess-1.0.1.jar
inflating: apache-maven-3.9.1/lib/javax.inject-1.jar
inflating: apache-maven-3.9.1/lib/javax.annotation-api-1.3.2.jar
inflating: apache-maven-3.9.1/lib/plexus-utils-3.5.1.jar
inflating: apache-maven-3.9.1/lib/plexus-sec-dispatcher-2.0.jar
inflating: apache-maven-3.9.1/lib/plexus-cipher-2.0.jar
inflating: apache-maven-3.9.1/lib/plexus-interpolation-1.26.jar
inflating: apache-maven-3.9.1/lib/slf4j-api-1.7.36.jar
inflating: apache-maven-3.9.1/lib/commons-lang3-3.8.1.jar
inflating: apache-maven-3.9.1/lib/maven-core-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-repository-metadata-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-artifact-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-provider-3.9.1.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-impl-1.9.7.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-named-locks-1.9.7.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-spi-1.9.7.jar
inflating: apache-maven-3.9.1/lib/org.eclipse.sisu.inject-0.3.5.jar
inflating: apache-maven-3.9.1/lib/plexus-component-annotations-2.1.0.jar
inflating: apache-maven-3.9.1/lib/maven-compat-3.9.1.jar
inflating: apache-maven-3.9.1/lib/wagon-provider-api-3.5.3.jar
inflating: apache-maven-3.9.1/lib/org.eclipse.sisu.plexus-0.3.5.jar
inflating: apache-maven-3.9.1/lib/commons-cli-1.4.jar
inflating: apache-maven-3.9.1/lib/wagon-http-3.5.3.jar
inflating: apache-maven-3.9.1/lib/wagon-http-shared-3.5.3.jar
inflating: apache-maven-3.9.1/lib/httpclient-4.5.14.jar
inflating: apache-maven-3.9.1/lib/commons-codec-1.11.jar
inflating: apache-maven-3.9.1/lib/wagon-file-3.5.3.jar
inflating: apache-maven-3.9.1/lib/jcl-over-slf4j-1.7.36.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-connector-basic-1.9.7.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-transport-file-1.9.7.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-transport-http-1.9.7.jar
inflating: apache-maven-3.9.1/lib/httpcore-4.4.15.jar
inflating: apache-maven-3.9.1/lib/maven-resolver-transport-wagon-1.9.7.jar
inflating: apache-maven-3.9.1/lib/maven-slf4j-provider-3.9.1.jar
inflating: apache-maven-3.9.1/lib/jansi-2.4.0.jar
[opc@new-k8s curl-examples]$ ll
total 11652
drwxr-xr-x. 6 opc opc 99 Mar 15 09:39 apache-maven-3.9.1
-rw-rw-r--. 1 opc opc 9143026 Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2784624 Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
How to unzip to different directory
Using -d parameter we can extract the zip package to different folder -q –> silent mode
Lets extract to /tmp folder
[opc@new-k8s tmp]$ pwd
/tmp
[opc@new-k8s tmp]$ ll
total 0
[opc@new-k8s tmp]$ cd ~/curl-examples/
[opc@new-k8s curl-examples]$ ll
total 11652
-rw-rw-r--. 1 opc opc 9143026 Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2784624 Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
[opc@new-k8s curl-examples]$ pwd
/home/opc/curl-examples
[opc@new-k8s curl-examples]$ unzip apache-maven-3.9.1-bin.zip -d /tmp
Archive: apache-maven-3.9.1-bin.zip
creating: /tmp/apache-maven-3.9.1/
creating: /tmp/apache-maven-3.9.1/lib/
creating: /tmp/apache-maven-3.9.1/boot/
creating: /tmp/apache-maven-3.9.1/lib/jansi-native/
creating: /tmp/apache-maven-3.9.1/lib/jansi-native/Windows/
creating: /tmp/apache-maven-3.9.1/lib/jansi-native/Windows/x86/
creating: /tmp/apache-maven-3.9.1/lib/jansi-native/Windows/x86_64/
creating: /tmp/apache-maven-3.9.1/bin/
creating: /tmp/apache-maven-3.9.1/conf/
creating: /tmp/apache-maven-3.9.1/conf/logging/
creating: /tmp/apache-maven-3.9.1/lib/ext/
creating: /tmp/apache-maven-3.9.1/lib/ext/hazelcast/
creating: /tmp/apache-maven-3.9.1/lib/ext/redisson/
inflating: /tmp/apache-maven-3.9.1/README.txt
inflating: /tmp/apache-maven-3.9.1/LICENSE
inflating: /tmp/apache-maven-3.9.1/NOTICE
inflating: /tmp/apache-maven-3.9.1/lib/aopalliance.license
inflating: /tmp/apache-maven-3.9.1/lib/commons-cli.license
inflating: /tmp/apache-maven-3.9.1/lib/commons-codec.license
inflating: /tmp/apache-maven-3.9.1/lib/commons-lang3.license
inflating: /tmp/apache-maven-3.9.1/lib/failureaccess.license
inflating: /tmp/apache-maven-3.9.1/lib/guava.license
inflating: /tmp/apache-maven-3.9.1/lib/guice.license
inflating: /tmp/apache-maven-3.9.1/lib/httpclient.license
inflating: /tmp/apache-maven-3.9.1/lib/httpcore.license
inflating: /tmp/apache-maven-3.9.1/lib/jansi.license
inflating: /tmp/apache-maven-3.9.1/lib/javax.annotation-api.license
inflating: /tmp/apache-maven-3.9.1/lib/javax.inject.license
inflating: /tmp/apache-maven-3.9.1/lib/jcl-over-slf4j.license
inflating: /tmp/apache-maven-3.9.1/lib/org.eclipse.sisu.inject.license
inflating: /tmp/apache-maven-3.9.1/lib/org.eclipse.sisu.plexus.license
inflating: /tmp/apache-maven-3.9.1/lib/plexus-cipher.license
inflating: /tmp/apache-maven-3.9.1/lib/plexus-component-annotations.license
inflating: /tmp/apache-maven-3.9.1/lib/plexus-interpolation.license
inflating: /tmp/apache-maven-3.9.1/lib/plexus-sec-dispatcher.license
inflating: /tmp/apache-maven-3.9.1/lib/plexus-utils.license
inflating: /tmp/apache-maven-3.9.1/lib/slf4j-api.license
inflating: /tmp/apache-maven-3.9.1/boot/plexus-classworlds.license
inflating: /tmp/apache-maven-3.9.1/lib/jansi-native/Windows/x86/jansi.dll
inflating: /tmp/apache-maven-3.9.1/lib/jansi-native/Windows/x86_64/jansi.dll
inflating: /tmp/apache-maven-3.9.1/bin/m2.conf
inflating: /tmp/apache-maven-3.9.1/bin/mvn.cmd
inflating: /tmp/apache-maven-3.9.1/bin/mvnDebug.cmd
inflating: /tmp/apache-maven-3.9.1/bin/mvn
inflating: /tmp/apache-maven-3.9.1/bin/mvnDebug
inflating: /tmp/apache-maven-3.9.1/bin/mvnyjp
inflating: /tmp/apache-maven-3.9.1/conf/logging/simplelogger.properties
inflating: /tmp/apache-maven-3.9.1/conf/settings.xml
inflating: /tmp/apache-maven-3.9.1/conf/toolchains.xml
inflating: /tmp/apache-maven-3.9.1/lib/ext/README.txt
inflating: /tmp/apache-maven-3.9.1/lib/ext/hazelcast/README.txt
inflating: /tmp/apache-maven-3.9.1/lib/ext/redisson/README.txt
inflating: /tmp/apache-maven-3.9.1/lib/jansi-native/README.txt
inflating: /tmp/apache-maven-3.9.1/boot/plexus-classworlds-2.6.0.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-embedder-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-settings-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-settings-builder-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-plugin-api-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-model-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-model-builder-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-builder-support-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-api-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-util-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-shared-utils-3.3.4.jar
inflating: /tmp/apache-maven-3.9.1/lib/guice-5.1.0.jar
inflating: /tmp/apache-maven-3.9.1/lib/aopalliance-1.0.jar
inflating: /tmp/apache-maven-3.9.1/lib/guava-30.1-jre.jar
inflating: /tmp/apache-maven-3.9.1/lib/failureaccess-1.0.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/javax.inject-1.jar
inflating: /tmp/apache-maven-3.9.1/lib/javax.annotation-api-1.3.2.jar
inflating: /tmp/apache-maven-3.9.1/lib/plexus-utils-3.5.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/plexus-sec-dispatcher-2.0.jar
inflating: /tmp/apache-maven-3.9.1/lib/plexus-cipher-2.0.jar
inflating: /tmp/apache-maven-3.9.1/lib/plexus-interpolation-1.26.jar
inflating: /tmp/apache-maven-3.9.1/lib/slf4j-api-1.7.36.jar
inflating: /tmp/apache-maven-3.9.1/lib/commons-lang3-3.8.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-core-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-repository-metadata-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-artifact-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-provider-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-impl-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-named-locks-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-spi-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/org.eclipse.sisu.inject-0.3.5.jar
inflating: /tmp/apache-maven-3.9.1/lib/plexus-component-annotations-2.1.0.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-compat-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/wagon-provider-api-3.5.3.jar
inflating: /tmp/apache-maven-3.9.1/lib/org.eclipse.sisu.plexus-0.3.5.jar
inflating: /tmp/apache-maven-3.9.1/lib/commons-cli-1.4.jar
inflating: /tmp/apache-maven-3.9.1/lib/wagon-http-3.5.3.jar
inflating: /tmp/apache-maven-3.9.1/lib/wagon-http-shared-3.5.3.jar
inflating: /tmp/apache-maven-3.9.1/lib/httpclient-4.5.14.jar
inflating: /tmp/apache-maven-3.9.1/lib/commons-codec-1.11.jar
inflating: /tmp/apache-maven-3.9.1/lib/wagon-file-3.5.3.jar
inflating: /tmp/apache-maven-3.9.1/lib/jcl-over-slf4j-1.7.36.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-connector-basic-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-transport-file-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-transport-http-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/httpcore-4.4.15.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-resolver-transport-wagon-1.9.7.jar
inflating: /tmp/apache-maven-3.9.1/lib/maven-slf4j-provider-3.9.1.jar
inflating: /tmp/apache-maven-3.9.1/lib/jansi-2.4.0.jar
[opc@new-k8s curl-examples]$ ll
total 11652
-rw-rw-r--. 1 opc opc 9143026 Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2784624 Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
[opc@new-k8s curl-examples]$ cd /tmp
[opc@new-k8s tmp]$ pwd
/tmp
[opc@new-k8s tmp]$ ll
total 0
drwxr-xr-x. 6 opc opc 99 Mar 15 09:39 apache-maven-3.9.1
How to extract tar or tar.gz file
[opc@new-k8s curl-examples]$ ll
total 11652
-rw-rw-r--. 1 opc opc 9143026 Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2784624 Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
[opc@new-k8s curl-examples]$ pwd
/home/opc/curl-examples
[opc@new-k8s curl-examples]$ tar --version
tar (GNU tar) 1.26
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by John Gilmore and Jay Fenlason.
[opc@new-k8s curl-examples]$ tar -xvf apache-maven-3.9.1-src.tar.gz
apache-maven-3.9.1/
apache-maven-3.9.1/.github/
apache-maven-3.9.1/.github/workflows/
apache-maven-3.9.1/apache-maven/
apache-maven-3.9.1/apache-maven/src/
apache-maven-3.9.1/apache-maven/src/bin/
apache-maven-3.9.1/apache-maven/src/conf/
apache-maven-3.9.1/apache-maven/src/conf/logging/
apache-maven-3.9.1/apache-maven/src/lib/
apache-maven-3.9.1/apache-maven/src/lib/ext/
apache-maven-3.9.1/apache-maven/src/lib/ext/hazelcast/
apache-maven-3.9.1/apache-maven/src/lib/ext/redisson/
apache-maven-3.9.1/apache-maven/src/lib/jansi-native/
apache-maven-3.9.1/apache-maven/src/main/
apache-maven-3.9.1/apache-maven/src/main/appended-resources/
apache-maven-3.9.1/apache-maven/src/main/appended-resources/META-INF/
apache-maven-3.9.1/apache-maven/src/main/appended-resources/licenses/
apache-maven-3.9.1/apache-maven/src/main/assembly/
apache-maven-3.9.1/apache-maven/src/site/
apache-maven-3.9.1/apache-maven/src/site/apt/
apache-maven-3.9.1/apache-maven/src/test/
apache-maven-3.9.1/apache-maven/src/test/java/
apache-maven-3.9.1/apache-maven/src/test/java/org/
apache-maven-3.9.1/apache-maven/src/test/java/org/apache/
apache-maven-3.9.1/apache-maven/src/test/java/org/apache/maven/
apache-maven-3.9.1/apache-maven/src/test/java/org/apache/maven/settings/
apache-maven-3.9.1/maven-artifact/
apache-maven-3.9.1/maven-artifact/src/
apache-maven-3.9.1/maven-artifact/src/main/
apache-maven-3.9.1/maven-artifact/src/main/java/
apache-maven-3.9.1/maven-artifact/src/main/java/org/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/handler/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/metadata/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/repository/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/repository/layout/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/repository/metadata/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/resolver/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/resolver/filter/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/artifact/versioning/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/repository/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/repository/legacy/
apache-maven-3.9.1/maven-artifact/src/main/java/org/apache/maven/repository/legacy/metadata/
[opc@new-k8s curl-examples]$ ll -h
total 12M
drwxr-xr-x. 18 opc opc 4.0K Mar 15 09:39 apache-maven-3.9.1
-rw-rw-r--. 1 opc opc 8.8M Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2.7M Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
[opc@new-k8s curl-examples]$ cd apache-maven-3.9.1/
[opc@new-k8s apache-maven-3.9.1]$ ll
total 108
drwxr-xr-x. 3 opc opc 50 Apr 17 13:48 apache-maven
-rw-r--r--. 1 opc opc 4726 Mar 15 09:39 CONTRIBUTING.md
-rw-r--r--. 1 opc opc 11354 Mar 15 09:39 DEPENDENCIES
-rw-r--r--. 1 opc opc 871 Mar 15 09:39 deploySite.sh
-rw-r--r--. 1 opc opc 23461 Mar 15 09:39 doap_Maven.rdf
-rw-r--r--. 1 opc opc 7487 Mar 15 09:39 Jenkinsfile
-rw-r--r--. 1 opc opc 11358 Mar 15 09:39 LICENSE
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-artifact
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-builder-support
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-compat
drwxr-xr-x. 3 opc opc 88 Apr 17 13:48 maven-core
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-embedder
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-model
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-model-builder
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-plugin-api
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-repository-metadata
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-resolver-provider
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-settings
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-settings-builder
drwxr-xr-x. 3 opc opc 32 Apr 17 13:48 maven-slf4j-provider
-rw-r--r--. 1 opc opc 166 Mar 15 09:39 NOTICE
-rw-r--r--. 1 opc opc 28045 Mar 15 09:39 pom.xml
-rw-r--r--. 1 opc opc 4114 Mar 15 09:39 README.md
drwxr-xr-x. 3 opc opc 18 Mar 15 09:39 src
[opc@new-k8s apache-maven-3.9.1]$ du -sh .
14M .
How to extract to different folder using tar command and in silent mode
Use -C argument to extract to different directory
By default tar dosen’t print any logs to output, if we use -v it shows the logs(extracting files names)
[opc@new-k8s tmp]$ pwd
/tmp
[opc@new-k8s tmp]$ ll
total 0
[opc@new-k8s tmp]$ cd ~/curl-examples/
[opc@new-k8s curl-examples]$ pwd
/home/opc/curl-examples
[opc@new-k8s curl-examples]$ ll
total 11652
-rw-rw-r--. 1 opc opc 9143026 Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2784624 Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
[opc@new-k8s curl-examples]$ tar -xf apache-maven-3.9.1-src.tar.gz -C /tmp
[opc@new-k8s curl-examples]$ ll
total 11652
-rw-rw-r--. 1 opc opc 9143026 Apr 17 13:35 apache-maven-3.9.1-bin.zip
-rw-rw-r--. 1 opc opc 2784624 Apr 17 13:38 apache-maven-3.9.1-src.tar.gz
[opc@new-k8s curl-examples]$ cd /tmp/
[opc@new-k8s tmp]$ ll
total 4
drwxr-xr-x. 18 opc opc 4096 Mar 15 09:39 apache-maven-3.9.1
[opc@new-k8s tmp]$ pwd
/tmp
How to create a zip file
zip -r ZIP_FILE_NAME.zip folder_name
or
zip ZIP_FILE_NAME.zip file1.ttx file2.txt
-q –> Silent mode
[opc@new-k8s zip-file]$ pwd
/home/opc/zip-file
[opc@new-k8s zip-file]$ ll
total 0
drwxr-xr-x. 6 opc opc 99 Mar 15 09:39 apache-maven-3.9.1
[opc@new-k8s zip-file]$ ll apache-maven-3.9.1/
total 36
drwxr-xr-x. 2 opc opc 97 Mar 15 09:39 bin
drwxr-xr-x. 2 opc opc 76 Mar 15 09:39 boot
drwxr-xr-x. 3 opc opc 63 Mar 15 09:39 conf
drwxr-xr-x. 4 opc opc 4096 Mar 15 09:39 lib
-rw-r--r--. 1 opc opc 18644 Mar 15 09:39 LICENSE
-rw-r--r--. 1 opc opc 5036 Mar 15 09:39 NOTICE
-rw-r--r--. 1 opc opc 2533 Mar 15 09:39 README.txt
[opc@new-k8s zip-file]$ zip -r newapache-maven.zip apache-maven-3.9.1
adding: apache-maven-3.9.1/ (stored 0%)
adding: apache-maven-3.9.1/lib/ (stored 0%)
adding: apache-maven-3.9.1/lib/jansi-native/ (stored 0%)
adding: apache-maven-3.9.1/lib/jansi-native/Windows/ (stored 0%)
adding: apache-maven-3.9.1/lib/jansi-native/Windows/x86/ (stored 0%)
adding: apache-maven-3.9.1/lib/jansi-native/Windows/x86/jansi.dll (deflated 69%)
adding: apache-maven-3.9.1/lib/jansi-native/Windows/x86_64/ (stored 0%)
adding: apache-maven-3.9.1/lib/jansi-native/Windows/x86_64/jansi.dll (deflated 70%)
adding: apache-maven-3.9.1/lib/jansi-native/README.txt (deflated 40%)
adding: apache-maven-3.9.1/lib/ext/ (stored 0%)
adding: apache-maven-3.9.1/lib/ext/hazelcast/ (stored 0%)
adding: apache-maven-3.9.1/lib/ext/hazelcast/README.txt (deflated 35%)
adding: apache-maven-3.9.1/lib/ext/redisson/ (stored 0%)
adding: apache-maven-3.9.1/lib/ext/redisson/README.txt (deflated 34%)
adding: apache-maven-3.9.1/lib/ext/README.txt (deflated 26%)
adding: apache-maven-3.9.1/lib/aopalliance.license (stored 0%)
adding: apache-maven-3.9.1/lib/commons-cli.license (deflated 65%)
adding: apache-maven-3.9.1/lib/commons-codec.license (deflated 65%)
adding: apache-maven-3.9.1/lib/commons-lang3.license (deflated 65%)
adding: apache-maven-3.9.1/lib/failureaccess.license (deflated 65%)
adding: apache-maven-3.9.1/lib/guava.license (deflated 65%)
adding: apache-maven-3.9.1/lib/guice.license (deflated 65%)
adding: apache-maven-3.9.1/lib/httpclient.license (deflated 65%)
adding: apache-maven-3.9.1/lib/httpcore.license (deflated 65%)
adding: apache-maven-3.9.1/lib/jansi.license (deflated 65%)
adding: apache-maven-3.9.1/lib/javax.annotation-api.license (deflated 67%)
adding: apache-maven-3.9.1/lib/javax.inject.license (deflated 65%)
adding: apache-maven-3.9.1/lib/jcl-over-slf4j.license (deflated 65%)
adding: apache-maven-3.9.1/lib/org.eclipse.sisu.inject.license (deflated 63%)
adding: apache-maven-3.9.1/lib/org.eclipse.sisu.plexus.license (deflated 63%)
adding: apache-maven-3.9.1/lib/plexus-cipher.license (deflated 65%)
adding: apache-maven-3.9.1/lib/plexus-component-annotations.license (deflated 65%)
adding: apache-maven-3.9.1/lib/plexus-interpolation.license (deflated 65%)
adding: apache-maven-3.9.1/lib/plexus-sec-dispatcher.license (deflated 65%)
adding: apache-maven-3.9.1/lib/plexus-utils.license (deflated 65%)
adding: apache-maven-3.9.1/lib/slf4j-api.license (deflated 42%)
adding: apache-maven-3.9.1/lib/maven-embedder-3.9.1.jar (deflated 10%)
adding: apache-maven-3.9.1/lib/maven-settings-3.9.1.jar (deflated 8%)
adding: apache-maven-3.9.1/lib/maven-settings-builder-3.9.1.jar (deflated 17%)
adding: apache-maven-3.9.1/lib/maven-plugin-api-3.9.1.jar (deflated 12%)
adding: apache-maven-3.9.1/lib/maven-model-3.9.1.jar (deflated 5%)
adding: apache-maven-3.9.1/lib/maven-model-builder-3.9.1.jar (deflated 12%)
adding: apache-maven-3.9.1/lib/maven-builder-support-3.9.1.jar (deflated 18%)
adding: apache-maven-3.9.1/lib/maven-resolver-api-1.9.7.jar (deflated 14%)
adding: apache-maven-3.9.1/lib/maven-resolver-util-1.9.7.jar (deflated 11%)
adding: apache-maven-3.9.1/lib/maven-shared-utils-3.3.4.jar (deflated 9%)
adding: apache-maven-3.9.1/lib/guice-5.1.0.jar (deflated 9%)
adding: apache-maven-3.9.1/lib/aopalliance-1.0.jar (deflated 41%)
adding: apache-maven-3.9.1/lib/guava-30.1-jre.jar (deflated 11%)
adding: apache-maven-3.9.1/lib/failureaccess-1.0.1.jar (deflated 40%)
adding: apache-maven-3.9.1/lib/javax.inject-1.jar (deflated 28%)
adding: apache-maven-3.9.1/lib/javax.annotation-api-1.3.2.jar (deflated 12%)
adding: apache-maven-3.9.1/lib/plexus-utils-3.5.1.jar (deflated 7%)
adding: apache-maven-3.9.1/lib/plexus-sec-dispatcher-2.0.jar (deflated 18%)
adding: apache-maven-3.9.1/lib/plexus-cipher-2.0.jar (deflated 16%)
adding: apache-maven-3.9.1/lib/plexus-interpolation-1.26.jar (deflated 15%)
adding: apache-maven-3.9.1/lib/slf4j-api-1.7.36.jar (deflated 12%)
adding: apache-maven-3.9.1/lib/commons-lang3-3.8.1.jar (deflated 8%)
adding: apache-maven-3.9.1/lib/maven-core-3.9.1.jar (deflated 10%)
adding: apache-maven-3.9.1/lib/maven-repository-metadata-3.9.1.jar (deflated 12%)
adding: apache-maven-3.9.1/lib/maven-artifact-3.9.1.jar (deflated 13%)
adding: apache-maven-3.9.1/lib/maven-resolver-provider-3.9.1.jar (deflated 9%)
adding: apache-maven-3.9.1/lib/maven-resolver-impl-1.9.7.jar (deflated 10%)
adding: apache-maven-3.9.1/lib/maven-resolver-named-locks-1.9.7.jar (deflated 15%)
adding: apache-maven-3.9.1/lib/maven-resolver-spi-1.9.7.jar (deflated 23%)
adding: apache-maven-3.9.1/lib/org.eclipse.sisu.inject-0.3.5.jar (deflated 9%)
adding: apache-maven-3.9.1/lib/plexus-component-annotations-2.1.0.jar (deflated 43%)
adding: apache-maven-3.9.1/lib/maven-compat-3.9.1.jar (deflated 10%)
adding: apache-maven-3.9.1/lib/wagon-provider-api-3.5.3.jar (deflated 13%)
adding: apache-maven-3.9.1/lib/org.eclipse.sisu.plexus-0.3.5.jar (deflated 14%)
adding: apache-maven-3.9.1/lib/commons-cli-1.4.jar (deflated 8%)
adding: apache-maven-3.9.1/lib/wagon-http-3.5.3.jar (deflated 19%)
adding: apache-maven-3.9.1/lib/wagon-http-shared-3.5.3.jar (deflated 8%)
adding: apache-maven-3.9.1/lib/httpclient-4.5.14.jar (deflated 9%)
adding: apache-maven-3.9.1/lib/commons-codec-1.11.jar (deflated 16%)
adding: apache-maven-3.9.1/lib/wagon-file-3.5.3.jar (deflated 16%)
adding: apache-maven-3.9.1/lib/jcl-over-slf4j-1.7.36.jar (deflated 15%)
adding: apache-maven-3.9.1/lib/maven-resolver-connector-basic-1.9.7.jar (deflated 10%)
adding: apache-maven-3.9.1/lib/maven-resolver-transport-file-1.9.7.jar (deflated 15%)
adding: apache-maven-3.9.1/lib/maven-resolver-transport-http-1.9.7.jar (deflated 9%)
adding: apache-maven-3.9.1/lib/httpcore-4.4.15.jar (deflated 10%)
adding: apache-maven-3.9.1/lib/maven-resolver-transport-wagon-1.9.7.jar (deflated 15%)
adding: apache-maven-3.9.1/lib/maven-slf4j-provider-3.9.1.jar (deflated 11%)
adding: apache-maven-3.9.1/lib/jansi-2.4.0.jar (deflated 6%)
adding: apache-maven-3.9.1/boot/ (stored 0%)
adding: apache-maven-3.9.1/boot/plexus-classworlds.license (deflated 65%)
adding: apache-maven-3.9.1/boot/plexus-classworlds-2.6.0.jar (deflated 14%)
adding: apache-maven-3.9.1/bin/ (stored 0%)
adding: apache-maven-3.9.1/bin/m2.conf (deflated 52%)
adding: apache-maven-3.9.1/bin/mvn.cmd (deflated 64%)
adding: apache-maven-3.9.1/bin/mvnDebug.cmd (deflated 55%)
adding: apache-maven-3.9.1/bin/mvn (deflated 62%)
adding: apache-maven-3.9.1/bin/mvnDebug (deflated 51%)
adding: apache-maven-3.9.1/bin/mvnyjp (deflated 48%)
adding: apache-maven-3.9.1/conf/ (stored 0%)
adding: apache-maven-3.9.1/conf/logging/ (stored 0%)
adding: apache-maven-3.9.1/conf/logging/simplelogger.properties (deflated 52%)
adding: apache-maven-3.9.1/conf/settings.xml (deflated 63%)
adding: apache-maven-3.9.1/conf/toolchains.xml (deflated 60%)
adding: apache-maven-3.9.1/README.txt (deflated 57%)
adding: apache-maven-3.9.1/LICENSE (deflated 72%)
adding: apache-maven-3.9.1/NOTICE (deflated 58%)
[opc@new-k8s zip-file]$ ll
total 8924
drwxr-xr-x. 6 opc opc 99 Mar 15 09:39 apache-maven-3.9.1
-rw-rw-r--. 1 opc opc 9137892 Apr 17 14:39 newapache-maven.zip
Sample JSON file
Json file contains the key vaue pair
Json file name ends with extension “.json” eg: output.json
{
"name": "john",
"age": "30",
"car": "BMW",
"games": ["cricket", "basketball", "badminton"]
}
or
{"name":"John", "age":30, "car":null, "games": ["cricket", "basketball", "badminton"]}
Curl command to retrieve the Rest api response (JSON)
Most of the time curl command is used for calling the rest api
In simple term, Rest api is URL(https://example.com), when we call that url , you will get a response data.
The most of the case the response data will be a JSON
Actual Data in GUI : https://github.com/vigneshsweekaran/hello-world/releases/tag/clean
[opc@new-k8s redirection]$ curl https://api.github.com/repos/vigneshsweekaran/hello-world/releases/latest
{
"url": "https://api.github.com/repos/vigneshsweekaran/hello-world/releases/43010389",
"assets_url": "https://api.github.com/repos/vigneshsweekaran/hello-world/releases/43010389/assets",
"upload_url": "https://uploads.github.com/repos/vigneshsweekaran/hello-world/releases/43010389/assets{?name,label}",
"html_url": "https://github.com/vigneshsweekaran/hello-world/releases/tag/clean",
"id": 43010389,
"author": {
"login": "vigneshsweekaran",
"id": 40670015,
"node_id": "MDQ6VXNlcjQwNjcwMDE1",
"avatar_url": "https://avatars.githubusercontent.com/u/40670015?v=4",
"gravatar_id": "",
"url": "https://api.github.com/users/vigneshsweekaran",
"html_url": "https://github.com/vigneshsweekaran",
"followers_url": "https://api.github.com/users/vigneshsweekaran/followers",
"following_url": "https://api.github.com/users/vigneshsweekaran/following{/other_user}",
"gists_url": "https://api.github.com/users/vigneshsweekaran/gists{/gist_id}",
"starred_url": "https://api.github.com/users/vigneshsweekaran/starred{/owner}{/repo}",
"subscriptions_url": "https://api.github.com/users/vigneshsweekaran/subscriptions",
"organizations_url": "https://api.github.com/users/vigneshsweekaran/orgs",
"repos_url": "https://api.github.com/users/vigneshsweekaran/repos",
"events_url": "https://api.github.com/users/vigneshsweekaran/events{/privacy}",
"received_events_url": "https://api.github.com/users/vigneshsweekaran/received_events",
"type": "User",
"site_admin": false
},
"node_id": "MDc6UmVsZWFzZTQzMDEwMzg5",
"tag_name": "clean",
"target_commitish": "master",
"name": "Clean repo with maven application",
"draft": false,
"prerelease": false,
"created_at": "2021-05-16T06:18:49Z",
"published_at": "2021-05-16T06:26:47Z",
"assets": [
],
"tarball_url": "https://api.github.com/repos/vigneshsweekaran/hello-world/tarball/clean",
"zipball_url": "https://api.github.com/repos/vigneshsweekaran/hello-world/zipball/clean",
"body": ""
}
How to store the Json response data from rest api to a file
[opc@new-k8s ~]$ mkdir json-response
[opc@new-k8s ~]$ cd json-response/
[opc@new-k8s json-response]$ ll
total 0
[opc@new-k8s json-response]$ pwd
/home/opc/json-response
[opc@new-k8s json-response]$ curl https://api.github.com/repos/vigneshsweekaran/hello-world/releases/latest > output.json
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 2026 100 2026 0 0 2809 0 --:--:-- --:--:-- --:--:-- 2809
[opc@new-k8s json-response]$ ll
total 4
-rw-rw-r--. 1 opc opc 2026 Apr 17 14:23 output.json
[opc@new-k8s json-response]$ cat output.json
{
"url": "https://api.github.com/repos/vigneshsweekaran/hello-world/releases/43010389",
"assets_url": "https://api.github.com/repos/vigneshsweekaran/hello-world/releases/43010389/assets",
"upload_url": "https://uploads.github.com/repos/vigneshsweekaran/hello-world/releases/43010389/assets{?name,label}",
"html_url": "https://github.com/vigneshsweekaran/hello-world/releases/tag/clean",
"id": 43010389,
"author": {
"login": "vigneshsweekaran",
"id": 40670015,
"node_id": "MDQ6VXNlcjQwNjcwMDE1",
"avatar_url": "https://avatars.githubusercontent.com/u/40670015?v=4",
"gravatar_id": "",
"url": "https://api.github.com/users/vigneshsweekaran",
"html_url": "https://github.com/vigneshsweekaran",
"followers_url": "https://api.github.com/users/vigneshsweekaran/followers",
"following_url": "https://api.github.com/users/vigneshsweekaran/following{/other_user}",
"gists_url": "https://api.github.com/users/vigneshsweekaran/gists{/gist_id}",
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