每天一命令（9）echo (display a line of text)

echo (display a line of text)

man echo 查看命令文档

-n do not output the trailing newline 输出不换行

-e enable interpretation of backslash escapes 让转义字符起作用

-E disable interpretation of backslash escapes (default) 禁用转义字符

下面栗子：

root@myql01  ~
# echo 123
123

root@myql01  ~
# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

root@myql01  ~
# echo `date`
Mon Jun 13 10:41:11 CST 2016

root@myql01  ~
# echo date
date

root@myql01  ~
# echo "date"
date

root@myql01  ~
# echo "$HOME"
/root

root@myql01  ~
# name=zhangsan

root@myql01  ~
# echo $name
zhangsan

root@myql01  ~
# echo "1234556\n123123";
1234556\n123123

root@myql01  ~
# echo -e "1234556\n123123";
1234556
123123

root@myql01  ~
# echo -n "1234556\n123123";
1234556\n123123
root@myql01  ~
# echo -ne "1234556\n123123";
1234556
123123
root@myql01  ~
# echo {1..10}
1 2 3 4 5 6 7 8 9 10

root@myql01  ~
# echo {a..z}
a b c d e f g h i j k l m n o p q r s t u v w x y z