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)