Shell some methods

String interception from the original address: http://www.jb51.net/article/56563.htm

One: string interception

There are VAR variables:

var=http://www.aaa.com/123.htm

1. # Intercept, delete the left character, leave the right character.

echo ${var#*//}
Www.aaa.com/123.htm

2. # # Intercept, delete the left character and leave the right character.

echo ${var##*/}123. htm

3.% Intercept, delete right character, leave left character

echo ${var%/*}http://www.aaa.com

4. The percent number intercept, delete the right character, leave the left character

echo ${var/*}http:

5. Start with the first few characters on the left and the number of characters

echo ${var:0:5} #其中的 0 represents the beginning of the first character on the left and 5 represents the total number of characters.
http

6. Starting from the first few characters on the left, until the end

echo ${var:7}   7  means the 8th character on the left begins, until the end. www.aaa.com/123. htm

7. Start with the first few characters on the right and the number of characters

echo ${var:0-7:3}                0-7 means the seventh character starts at the right,3  Represents the number of characters.  123

8. Start with the first few characters on the right and continue to the end.

echo ${var:0-7}                    #表示从右边第七个字符开始, until the end.  123. htm

To judge a string containing a relationship from: http://www.cnblogs.com/ginsonwang/p/5525340.html

Two: The judgment string contains

1

Stra="Long String"StrB="string"result=$ (echo $strA | grep"${STRB}")if[["$result"!=""]]then Echo"include"ElseEcho"does not contain"fi

2

Stra="helloworld"strB="low"if [[$strA =~ $strB]] Then    " contains "else  "does not contain     " fi

3

A="helloworld"B="low"if [[$A = = * $B * ] ]then    " contains "else  "does not contain     " fi

4

thisstring="1 2 3 4 5"  # source string searchstring="1 2"  # Search string case in      *"$searchString"*) echo Enemy Spot;    *) echo nope;; ESA

5

string_a=$1string_b=$2if [[${string_a/${string_b}//} = = $STRING _ A] then was not substring.                echo N        return0    else is          substring.        echo Y        return1    fi

Shell some methods