Linux Log & Text Processing – Full Quiz

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This quiz contains 20 questions focused on Linux log analysis and text processing. These commands are heavily used by DevOps engineers for debugging production issues and analyzing application logs.

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Which command searches for a pattern in a file?

grep

awk

sed

cut

The grep (Global Regular Expression Print) command searches for a specific string or pattern in a file and prints the matching lines.

#

Which option with grep performs a case-insensitive search?

-v

-i

-n

-r

The -i option tells grep to ignore case distinctions while searching (e.g., matching both "Error" and "error").

#

Which option with grep shows line numbers?

-n

-l

-c

-v

The -n option displays the line number along with the content of the matching line.

#

Which command prints only matching lines from a file?

grep

awk

sed

sort

grep is designed specifically to output lines that match a given pattern.

#

Which command is commonly used for column-based text processing?

grep

awk

sed

less

awk is a powerful text-processing tool optimized for handling structured data like columns and rows.

#

Which command is best suited for search-and-replace operations?

grep

awk

sed

sort

sed (stream editor) is widely used for finding and replacing text within a stream or file.

#

Which command extracts specific columns from text?

awk

cut

sed

paste

The cut command allows you to remove sections from each line of files, typically extracting specific columns.

#

Which option with cut specifies a delimiter?

-f

-d

-c

-s

The -d option allows you to define a custom delimiter (like a comma or colon) to separate fields.

#

Which option with cut specifies fields?

-f

-d

-c

-s

The -f option specifies which fields (columns) to select after splitting by the delimiter.

#

Which command sorts lines alphabetically?

uniq

sort

grep

head

The sort command arranges lines of text file in alphabetical or numerical order.

#

Which command removes duplicate adjacent lines?

uniq

sort

awk

sed

uniq filters out repeated lines in a file, but they must be adjacent (next to each other).

#

Which command is commonly used with sort to remove duplicates?

grep

uniq

cut

sed

Since uniq only detects adjacent duplicates, it is almost always paired with sort (e.g., sort | uniq).

#

Which command prints the first few lines of a file?

head

tail

less

more

The head command outputs the first part of files (default is top 10 lines).

#

Which command prints the last few lines of a file?

head

tail

less

more

The tail command outputs the last part of files (default is last 10 lines).

#

Which option with tail follows a file as it grows?

-n

-f

-r

-v

The -f (follow) option causes tail to not stop when end of file is reached, but to append data as the file grows.

#

Which command is best for viewing large log files interactively?

cat

less

head

tail

less allows you to view the content of a file one page at a time and navigate forwards and backwards.

#

Which command counts the number of lines, words, or characters?

sort

wc

uniq

cut

The wc (word count) command prints newline, word, and byte counts for each file.

#

Which command counts the number of lines in a file?

wc -w

wc -l

wc -c

wc -m

The -l option with wc restricts the output to just the line count.

#

Which command is most useful for real-time log monitoring?

cat logfile

tail -f logfile

less logfile

head logfile

tail -f is the standard way to watch log files as they are being written to in real time.

#

Which tool is most commonly used to filter logs in production?

grep

sort

uniq

cut

grep is the go-to tool for filtering large log files to find errors or specific events.

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