The cat program is a standard Unix utility that concatenates and lists files. The name is an abbreviation of catenate, a synonym of concatenate.
Usage
The Single Unix Specification specifies that when the "cat" program is given files in a sequence as arguments, it will output their contents to the standard output in the same sequence. It mandates the support of one option flag, u (unbuffered), by which each byte is written to standard output without buffering as it is read. Many operating systems do this by default and ignore the flag.
If one of the input filenames is specified as a...