Shell tutorial-4 commonly used escape characters

4 commonly used escape characters

1. Backslash (\): Make a variable after the backslash a simple string.

[root@xsnq ~]# echo "\"xsnq\""
"xsnq"

2. Single quotation mark (''): escape all variables in it as simple strings.

[root@xsnq ~]# a=xsnq
[root@xsnq ~]# echo $a
xsnq
[root@xsnq ~]# echo '$a'
$a

3. Double quotation marks (""): Keep the variable attributes in it, without escaping.

[root@xsnq ~]# a=xsnq
[root@xsnq ~]# echo "$a"
xsnq

4. Backquote (``): Return the result after executing the command.

The key under Esc

[root@xsnq ~]# pwd
/root
[root@xsnq ~]# echo `pwd`
/root

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