Linux征途：每天一个linux命令
[root@6 ~]# man catCAT
(1) User Commands CAT(1)
NAME
cat - concatenate files and print on the standard output
//vt. 连结；使连锁； adj. 连结的；连锁的
//连接文件和标准输出打印
SYNOPSIS//摘要，概要，大纲
cat [OPTION]... [FILE]...
DESCRIPTION
Concatenate FILE(s), or standard input, to standard output.
-A, --show-all
equivalent to -vET
//-A=-vET 6 ~]# cat -A test2.txt This is rootkdssafkddfsdfsd$ dsfsdgg$ dsfsf$ The user is mrooooter is a dog's name$ $ $ chroot is a command$ mrooter is not a word$ $
-b, --number-nonblank
number nonempty output lines
//带行号输出非空的行数 ]# cat -b test2.txt 1 This is rootkdssafkddfsdfsd 2 dsfsdgg 3 dsfsf 4 The user is mrooooter is a dog's name 5 chroot is a command 6 mrooter is not a word
-e equivalent to -vE
//-e = -vE ~]# cat -e test2.txt This is rootkdssafkddfsdfsd$ dsfsdgg$ dsfsf$ The user is mrooooter is a dog's name$ $ $ chroot is a command$ mrooter is not a word$ $
-E, --show-ends
display $ at end of each line
//在结尾出显示$ ~]# cat -E test2.txt This is rootkdssafkddfsdfsd$ dsfsdgg$ dsfsf$ The user is mrooooter is a dog's name$ $ $ chroot is a command$ mrooter is not a word$ $
-n, --number
number all output lines
//带行号显示所有行 ~]# cat -n test2.txt 1 This is rootkdssafkddfsdfsd 2 dsfsdgg 3 dsfsf 4 The user is mrooooter is a dog's name 5 6 7 chroot is a command 8 mrooter is not a word 9
-s, --squeeze-blank
suppress repeated empty output lines
//抑制重复空行输出,有两个空行，只输出一个空行 ~]# cat -s test2.txt This is rootkdssafkddfsdfsd dsfsdgg dsfsf The user is mrooooter is a dog's name chroot is a command mrooter is not a word
-t equivalent to -vT
//-t=-vT [root@6~]# cat -t test2.txt This is rootkdssafkddfsdfsd dsfsdgg dsfsf The user is mrooooter is a dog's name chroot is a command mrooter is not a word [root@6 ~]# cat -vt test2.txt This is rootkdssafkddfsdfsd dsfsdgg dsfsf The user is mrooooter is a dog's name chroot is a command mrooter is not a word
-T, --show-tabs
display TAB characters as ^I
// [root@oldboy6 ~]# cat -T test2.txt This is rootkdssafkddfsdfsd dsfsdgg dsfsf The user is mrooooter is a dog's name chroot is a command mrooter is not a word [root@6 ~]#
-u (ignored)
-v, --show-nonprinting
use ^ and M- notation, except for LFD and TAB
// 使用 ^ 和 M- 引用，除了 LFD 和 TAB 之外
--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.
//输出f'的内容,然后标准输入,然后g的内容。操作只显示第一个文件的内容
cat Copy standard input to standard output.
AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman.
REPORTING BUGS
Report cat bugs to [email protected]
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 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 8.4 November 2013 CAT(1)
(END)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
[rooty6 ~]# cat --help
Usage: cat [OPTION]... [FILE]...
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.
Report cat bugs to [email protected]
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils 'cat invocation'