echo¶
打印字符串，相当于python里的print
打印alvin¶
echo hello
格式化打印，换行¶
-e参数，表示格式化打印，会将相应的参数转为对应的形式，比如将n转换为换行。
1 2 3 4 5 | [alvin@poppy ~]$ echo 'hello\nworld'
hello\nworld
[alvin@poppy ~]$ echo -e 'hello\nworld'
hello
world
|
显示结果定向至文件¶
[alvin@poppy ~]$ echo 'Alvin Daily' > file
[alvin@poppy ~]$ cat file
Alvin Daily
显示结果追加至文件¶
1 2 3 4 5 6 | [alvin@poppy ~]$ cat file
Alvin Daily
[alvin@poppy ~]$ echo 'Yes this is Alvin' >> file
[alvin@poppy ~]$ cat file
Alvin Daily
Yes this is Alvin
|
原样输出字符串，不进行转义或取变量(用单引号)¶
[alvin@poppy ~]$ name='alvin'
[alvin@poppy ~]$ echo '$name\"'
$name\"
显示命令执行结果¶
[alvin@poppy ~]$ echo `date`
Mon Aug 13 17:14:20 CST 2018