echo 命令详解

echo命令用于在shell中打印shell变量的值，或者直接输出指定的字符串。

选项

-e：激活转义字符。 使用-e选项时，若字符串中出现以下字符，则特别加以处理，而不会将它当成一般文字输出： 
a 发出警告声； 
 删除前一个字符； 
c 最后不加上换行符号； 
f 换行但光标仍旧停留在原来的位置； 

 换行且光标移至行首； 

 光标移至行首，但不换行； 
	 插入tab； 
v 与f相同； 
\ 插入字符； 

nn 插入nnn（八进制）所代表的ASCII字符；

　　

输出颜色

文字色 e[1;31m 将颜色设置为红色 e[0m 将颜色重新置

颜色码：重置=0，黑色=30，红色=31，绿色=32，黄色=33，蓝色=34，洋红=35，青色=36，白色=37

eg:

[root@layzj022301 ~]# echo -e "e[1;31mThis is red texte[0m"
This is red text
[root@layzj022301 ~]# 
[root@layzj022301 ~]# echo -e "e[1;32mThis is green texte[0m" 
This is green text
[root@layzj022301 ~]# echo -e "e[1;33mThis is yellow texte[0m" 
This is yellow text
[root@layzj022301 ~]# echo -e "e[1;34mThis is blue texte[0m"  
This is blue text
[root@layzj022301 ~]# echo -e "e[1;35mThis is carmine texte[0m" 
This is carmine text
[root@layzj022301 ~]# echo -e "e[1;36mThis is cyan texte[0m" 
This is cyan text
[root@layzj022301 ~]# echo -e "e[1;37mThis is white texte[0m" 
This is white text
[root@layzj022301 ~]#

　　

背景色

颜色码：重置=0，黑色=40，红色=41，绿色=42，黄色=43，蓝色=44，洋红=45，青色=46，白色=47

eg:

[root@layzj022301 ~]# echo -e "e[1;47mThis is red texte[0m" 
This is red text
[root@layzj022301 ~]# echo -e "e[1;46mThis is green texte[0m" 
This is green text
[root@layzj022301 ~]# echo -e "e[1;45mThis is yellow texte[0m" 
This is yellow text
[root@layzj022301 ~]# echo -e "e[1;44mThis is blue texte[0m" 
This is blue text
[root@layzj022301 ~]# echo -e "e[1;43mThis is carmine texte[0m" 
This is carmine text
[root@layzj022301 ~]# echo -e "e[1;42mThis is cyan texte[0m" 
This is cyan text
[root@layzj022301 ~]# echo -e "e[1;41mThis is white texte[0m" 
This is white text
[root@layzj022301 ~]#

　　

文字闪动

[root@layzj022301 ~]# echo -e "33[37;31;5mHello This Wenderful Shell~~~33[39;49;0m" 
Hello This Wenderful Shell~~~
[root@layzj022301 ~]#

　　

man echo

[root@layzj022301 ~]# man echo      
ECHO(1)                          User Commands                         ECHO(1)

NAME
       echo - display a line of text

SYNOPSIS
       echo [SHORT-OPTION]... [STRING]...
       echo LONG-OPTION

DESCRIPTION
       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of backslash escapes

       -E     disable interpretation of backslash escapes (default)

       --help display this help and exit

       --version
              output version information and exit

       If -e is in effect, the following sequences are recognized:

       \     backslash

       a     alert (BEL)

            backspace

       c     produce no further output

       e     escape

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

       NNN  byte with octal value NNN (1 to 3 digits)

       xHH   byte with hexadecimal value HH (1 to 2 digits)

       NOTE: your shell may have its own version of echo, which usually supersedes the version described here.  Please refer to your shell’s documenta-
       tion for details about the options it supports.

AUTHOR
       Written by Brian Fox and Chet Ramey.

REPORTING BUGS
       Report echo bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report echo 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 echo is maintained as a Texinfo manual.  If the info and echo programs are properly installed at your site, the  com-
       mand

              info coreutils 'echo invocation'

       should give you access to the complete manual.

GNU coreutils 8.4                  June 2014                           ECHO(1)