test - check file types and compare values

( EXPRESSION )
 	EXPRESSION is true
! EXPRESSION
 	EXPRESSION is false
EXPRESSION1 -a EXPRESSION2
 	both EXPRESSION1 and EXPRESSION2 are true
EXPRESSION1 -o EXPRESSION2
 	either EXPRESSION1 or EXPRESSION2 is true
-n STRING
 	the length of STRING is nonzero
STRING	equivalent to -n STRING
-z STRING
 	the length of STRING is zero
STRING1 = STRING2
 	the strings are equal
STRING1 != STRING2
 	the strings are not equal
INTEGER1 -eq INTEGER2
 	INTEGER1 is equal to INTEGER2
INTEGER1 -ge INTEGER2
 	INTEGER1 is greater than or equal to INTEGER2
INTEGER1 -gt INTEGER2
 	INTEGER1 is greater than INTEGER2
INTEGER1 -le INTEGER2
 	INTEGER1 is less than or equal to INTEGER2
INTEGER1 -lt INTEGER2
 	INTEGER1 is less than INTEGER2
INTEGER1 -ne INTEGER2
 	INTEGER1 is not equal to INTEGER2
FILE1 -ef FILE2
 	FILE1 and FILE2 have the same device and inode numbers
FILE1 -nt FILE2
 	FILE1 is newer (modification date) than FILE2
FILE1 -ot FILE2
 	FILE1 is older than FILE2
-b FILE	FILE exists and is block special
-c FILE	FILE exists and is character special
-d FILE	FILE exists and is a directory
-e FILE	FILE exists
-f FILE	FILE exists and is a regular file
-g FILE	FILE exists and is set-group-ID
-G FILE	FILE exists and is owned by the effective group ID
-h FILE	FILE exists and is a symbolic link (same as -L)
-k FILE	FILE exists and has its sticky bit set
-L FILE	FILE exists and is a symbolic link (same as -h)
-O FILE	FILE exists and is owned by the effective user ID
-p FILE	FILE exists and is a named pipe
-r FILE	FILE exists and read permission is granted
-s FILE	FILE exists and has a size greater than zero
-S FILE	FILE exists and is a socket
-t FD	file descriptor FD is opened on a terminal
-u FILE	FILE exists and its set-user-ID bit is set
-w FILE	FILE exists and write permission is granted
-x FILE	FILE exists and execute (or search) permission is granted

Except for -h and -L, all FILE-related tests dereference symbolic links. Beware that parentheses need to be escaped (e.g., by backslashes) for shells. INTEGER may also be -l STRING, which evaluates to the length of STRING.

NOTE: your shell may have its own version of test and/or [, which usually supersedes the version described here. Please refer to your shell’s documentation for details about the options it supports.