Shell Primer-Special Symbols

Source: Internet
Author: User

Special Symbols: *

Description: Wildcard character, multiple characters. All files with the suffix ". txt" are listed to

[[email protected] 111]# ls *.txt
11.txt 1.txt 22.txt 2.txt 33.txt 3.txt

Special symbols:?

Description: Wildcard characters, one character.

[email protected] 111]# ls?. Txt
1.txt 2.txt 3.txt

Special Symbols: #

Description: #后的失效, for comment description

[[email protected] 111]# ls 1.txt 2.txt
1.txt 2.txt
[[email protected] 111]# #ls 1.txt 2.txt
[[email protected] 111]# ls 1.txt #2. txt

Special symbols: \

Note: the "#2. txt" is used as the file name for the ideographic symbol.

[[email protected] 111]# ls 1.txt \ #2. txt
LS: Unable to access #2.txt: No file or directory

Special Symbols: |

Description: Pipe character, throw the previous result to the back processing

[email protected] 111]# cat 1.txt |wc-l

Special symbol: $;! $ ;

Description: The prefix of the variable; the last used variable value; end of line

[Email protected] 111]# a=1
[Email protected] 111]# echo $a
[[email protected] 111]# ls!$
LS $a

Special symbols:;

Description: Used in the middle of two commands

[email protected] 111]# ls 1.txt; LS 2.txt

Special command: ~

Description: User's home directory symbol

[Email protected] 111]# CD ~
[Email protected] ~]# pwd

Special Symbol:&

Description: Run in the background,

[Email protected] ~]# & Sleep
[1] 1314
[[email protected] ~]# jobs
[1]+ Running Sleep &

Special Symbol:>;>>;2>;2>>;<


Special symbols: []

Description: [0-9] Represents a number of 0-9.

[[email protected] ~]# ls [12].txt
1.txt 2.txt

[[email protected] ~]# ls [0-9a-za-z].txt
1.txt 2.txt c.txt D.txt


Summary: *//?   //# //  \    //  |  //  $   /    ; &//~//[]//>;>>;<;2>;2>>

Shell Primer-Special Symbols

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