Functions
The following functions are used to construct this parameter:
-e FileName - FileName exists.Note: All remaining functions return true if the object (file or string) exists, and the condition specified is true.
-b Filename - Returns a True exit value if the specified FileName exists and is a block special file. -c FileName - FileName is a character special file. -d FileName - FileName is a directory. -f FileName - FileName is a regular file. -g FileName - FileName's Set Group ID bit is set. -h FileName - FileName is a symbolic link. -k FileName - FileName's sticky bit is set. -L FileName - FileName is a symbolic link. -p FileName - FileName is a named pipe (FIFO). -r FileName - FileName is readable by the current process. -s FileName - FileName has a size greater than 0. -t FileDescriptor - FileDescriptor is open and associated with a terminal. -u FileName - FileName's Set User ID bit is set. -w FileName - FileName's write flag is on. However, the FileName will not be writable on a read-only file system even if test indicates true. -x FileName - FileName's execute flag is on. If the specified file exists and is a directory, the True exit value indicates that the current process has permission to change (chdir) into the directory. file1 -nt file2 - file1 is newer than file2. file1 -ot file2 - file1 is older than file2. file1 -ef file2 - file1 is another name for file2. (symbolic link or hard link)Read more about this topic: Test (Unix)
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