-b, Checks if file is a block special file

-c, Checks if file is a character special file

-d, Checks if file is a directory

-f, Checks if file is an ordinary file as opposed to a directory or special file

-g, Checks if file has its set group ID (SGID) bit set

-k, Checks if file has its sticky bit set

-p, Checks if file is a named pipe

-t, Checks if file descriptor is open and associated with a terminal

-u, Checks if file has its Set User ID (SUID) bit set

-r, Checks if file is readable

-w, Checks if file is writable

-x, Checks if file is executable

-s, Checks if file has size greater than 0

-e, Checks if file exists