cat - concatenate files and print on the standard output
cat [OPTION] [FILE]...
Concatenate FILE(s), or standard input, to standard output.
With no FILE, or when FILE is -, read standard input.
cat f - g
Output f’s contents, then standard input, then g’s contents.
Written by Torbjorn Granlund and Richard M. Stallman.
Report bugs to <bug-coreutils@gnu.org>.
Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.
The full documentation for cat is maintained as a Texinfo manual. If the info and cat programs are properly installed at your site, the command
info cat
should give you access to the complete manual.