The shell condition in Linux determines if-A to-Z

[-A file] is true if file exists.

[-B file] True if file exists and is a block special file.

[-C file] True if file exists and is a word special.

[-D file] True if file exists and is a directory.

[-E File] True if file exists.

[-F file] True if file exists and is a normal file.

[-G file] True if file exists and Sgid has been set.

[-H file] True if file exists and is a symbolic connection.

[-K file] True if file exists and the sticky bit has been set.

[-P file] If file exists and is a name pipe (f if O) is true.

[-R File] True if file exists and is readable.

[-S file] True if file exists and the size is not O.

[-T FD] true if the file descriptor FD is open and points to a terminal.

[-u file] True if file exists and suid (set user ID) is set.

[-W file] True if file exists and is writable.

[-X file] True if file exists and is executable.

[-o file] True if file exists and is a valid user ID.

[-G file] True if file exists and is a valid user group.

[-L file] True if file exists and is a symbolic connection.

[-N file] If file exists and has been mod if IED since it is last read is true.

[-S file] True if file exists and is a socket.

[File1-nt FILE2] If FILE1 have been changed more recently than FILE2, or if FILE1 exists and FILE2 does not is true.

[File1-ot FILE2] If FILE1 is older than FILE2, or FILE2 exists and FILE1 does not exist, it is true.

[File1-ef FILE2] True if FILE1 and FILE2 point to the same device and node number.

[-O Optionname] true if the shell option "Optionname" is turned on.

[-Z STRING] "STRING" is true if the length is zero.

[-N STRING] or [string] "string" is true if the length is not 0 non-zero.

[STRING1 = = STRING2] If 2 strings are the same. "=" May is used instead of "= =" for strict POSIX compliance is true.

[STRING1! = STRING2] True if the strings are not equal.

[STRING1 < STRING2] if "STRING1" sorts before "STRING2" lexicographically in the current locale is true.

[STRING1 > STRING2] If the ' STRING1 ' sorts after ' STRING2 ' lexicographically in the ' current locale ' is true.

The shell condition in Linux determines if-A to-Z