cat(1) 命令

cat(1) 命令主要的作用

一是可以方便的打印配置文件信息，例如，查看配置文件是否正确写入。
二是可以利用管道命令将一个文件拼接到另一个文件中，例如在 SSH 中添加公钥。

另外，可以配合 grep 命令打印匹配的信息。

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   -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 [e-mail]
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 漏 2010 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
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 coreutils 'cat invocation'   should give you access to the complete manual.

GNU coreutils 8.5 February 2011 CAT(1)