cat command is used to concatenate or displays the contents of a file.
To use it, type cat, and then press enter key
/home/user# cat Hello World Hello World
The text indicates what we typed to cat
İf you type this row and then press enter
To display the contents of a file, type
/home/user# cat filename
To see linux commands press Tab key,
If you want to learn commands beginning with c you can write c then press Tab key
Display and concatenate files.
Will read from STDIN and print to STDOT every line you enter.
/home/user# cat file1 [file2] ...
Will concatenate all files in one and print them to STDOUT
/home/user# cat > filename
Will take whatever you type from STDIN and will put it into the file filename
To exit cat or cat > filename type Ctrl+D to indicate EOF (End of File). To end many unix command, type end-of-file command (EOF) [hold down the key labeled “Ctrl” and press “d” (Ctrl+d) ]
Linux Cat Command Man Page
CAT(1) User Commands CAT(1) NAME cat - concatenate files and print on the standard output SYNOPSIS cat [OPTION]... [FILE]... DESCRIPTION Concatenate FILE(s), or standard input, to standard output. -A, --show-all equivalent to -vET -b, --number-nonblank number nonempty output lines, overrides -n -e equivalent to -vE -E, --show-ends display $ at end of each line -n, --number number all output lines -s, --squeeze-blank suppress repeated empty output lines -t equivalent to -vT -T, --show-tabs display TAB characters as ^I -u (ignored) -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. EXAMPLES cat f - g Output f's contents, then standard input, then g's contents. cat Copy standard input to standard output. AUTHOR Written by Torbjorn Granlund and Richard M. Stallman. REPORTING BUGS Report cat bugs to email@example.com GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report cat translation bugs to <http://translationproject.org/team/> COPYRIGHT Copyright © 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO tac(1) The full documentation for cat is maintained as a Texinfo manual. If the info and cat programs are properly installed at your site, the com‐ mand info coreutils 'cat invocation' should give you access to the complete manual. GNU coreutils 8.21 March 2014 CAT(1)