[prashant]

The Operators for Test Expressions for Writing Shell Scripts in Fedora


-a file: Check that the file exists (same as –e).

-b file: Check whether the file is a special block device.

-c file: Check whether the file is a character special device.

-d file: Check whether the file is a directory.

-e file: Check whether the file exists (same as -a).

-f file: Check whether the file exists and is a regular file (for example, not a directory, socket, pipe, link, or device file).

-g file: Check whether the file has the set-group-id bit set.

-h file: Check whether the file is a symbolic link (same as –L).

-k file: Check whether the file has the sticky bit set.

-L file: Check whether the file is a symbolic link (same as -h).

-n string: Check whether the string length is greater than 0 bytes.

-O file: Check whether you own the file.

-p file: Check whether the file is a named pipe.

-r file: Check whether the file is readable by you.

-s file: Check whether the file exists and is larger than 0 bytes.

-S file: Check whether the file exists and is a socket.

-t fd: Check whether the file descriptor is connected to a terminal.

-u file: Check whether the file has the set-user-id bit set.

-w file: Check whether the file is writable by you.

-x file: Check whether the file is executable by you.

-z string: Check whether the length of the string is 0 (zero) bytes.

expr1 -a expr2: Check whether both the first and the second expressions are true.

expr1 -o expr2: Check whether either of the two expressions is true.

file1 -nt file2: Check whether the first file is newer than the second file (using the modification timestamp).

file1 -ot file2: Check whether the first file is older than the second file (using the modification timestamp).

file1 -ef file2: Check whether the two files are associated by a link (a hard link or a symbolic link).

var1 = var2: Check whether the first variable is equal to the second variable.

var1 -eq var2: Check whether the first variable is equal to the second variable.

var1 -ge var2: Check whether the first variable is greater than or equal to the second variable.

var1 -gt var2: Check whether the first variable is greater than the second variable.

var1 -le var2: Check whether the first variable is less than or equal to the second variable.

var1 -lt var2: Check whether the first variable is less than the second variable.

var1 != var2, var1 -ne var2: Check whether the first variable is not equal to the second variable.