Application Technology of shell variable quantum string

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[Email protected] zhouyu]# a= "I am Zhouyu"

[Email protected] zhouyu]# echo ${#a}

11

[Email protected] zhouyu]# echo $a | Wc-m

12

[[email protected] zhouyu]# echo ${a:2}

Am Zhouyu

[[email protected] zhouyu]# echo ${a:2:3}

Am

[Email protected] zhouyu]# echo $a | Cut-b 3-4

Am

[[email protected] zhouyu]# echo ${a#i am}

Zhouyu

[[email protected] zhouyu]# echo ${a# #i am}

Zhouyu

[[email protected] zhouyu]# echo ${a%zhouyu}

I am

[[email protected] zhouyu]# echo ${a%%zhouyu}

I am

[Email protected] zhouyu]# echo ${a/i am/you is}

You are Zhouyu

[email protected] zhouyu]#

Below we write a script let 1_zhouyu.txt 2_zhouyu.txt 3_zhouyu.txt the name of three files renamed to 1.txt 2.txt 3.txt file, how to change it. can refer to the following documents I wrote

What better way to ask Daniel to give a little advice

vim/root/zhouyu/1.sh content is

Cd/root/zhouyu

For i in ' LS *.zhouyu.txt ';

Do

MV $i ${i/_zhouyu.txt/.txt}

Done

That's how it works.

Here is the command rename, which is specifically used to change the file name, as follows:

Rename want to change the part changed to what changes the source file, below is an example

[[email protected] zhouyu]# ls

1.txt 2.txt 3.txt zhouyu.sh

[Email protected] zhouyu]# rename. txt. txt/root/zhouyu/*

[[email protected] zhouyu]# ls

1.TXT 2.TXT 3.TXT zhouyu.sh

[Email protected] zhouyu]#

This article is from "Love Zhou Yu" blog, please be sure to keep this source http://izhouyu.blog.51cto.com/10318932/1886563

Application Technology of shell variable quantum string