cat

concatenate and print files

TLDR

Print the contents of a file to the standard output

$ cat [file]
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Concatenate several files into the target file

$ cat [file1] [file2] > [target_file]
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Append several files into the target file

$ cat [file1] [file2] >> [target_file]
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Number all output lines

$ cat -n [file]
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Display non-printable and whitespace characters (with M- prefix if non-ASCII)

$ cat -v -t -e [file]
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SYNOPSIS

cat [OPTION]... [FILE]...

DESCRIPTION

Concatenate FILE(s) to standard output.

With no FILE, or when FILE is -, read standard input.

-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

EXAMPLES

cat f - g

Output f's contents, then standard input, then g's contents.

cat

Copy standard input to standard output.

REPORTING BUGS

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT

Copyright © 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://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) Full documentation <https://www.gnu.org/software/coreutils/cat> or available locally via: info '(coreutils) cat invocation'

AUTHOR

Written by Torbjorn Granlund and Richard M. Stallman.

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