'cat' is short for concatenation; it is a Unix utility program to print the contents of 1 or more files on the standard output. It is similar to the 'type' command in Windows.

See related link.

cat /proc/version

The above answer will only work on certain systems. For most Unix systems, use the 'uname' command to get the Unix version.

AIX uses the oslevel command.

cat file name

The 'type' command does approximately (but not exactly) the same thing as the 'cat' command.