2 Simple shell scripts (if,while,case statements)

Experimental requirements:

1. Write a script called sum.sh, prompting the user to enter an integer less than 100, and to calculate all integers from 1 to that number

2. Write a script called tar.sh, which is used to extract compressed files in. tar.gz or. tar.bz2 format, requiring a case statement

Experimental steps:

A

VI sum.sh

#!/bin/bash

# This is sum

While : #循环条件为真, equal to while true, loop is executed without exit 0 or break

Do

read-p "Please enter an integer of 1-100:" Nu #把屏幕输出的数字赋值给变量nu

expr $nu + 0 &>/dev/null #此条语句作用是判断这个数字是否为0或者不是整数 and does not display this number on the screen

if [$?-ne 0] | |  [$nu-ge] #如果上条语句是非0的结果则表示错误, or the number greater than or equal to 100 does not meet the experimental requirements

then echo "The $nu you entered does not meet the requirements, please re-enter:" #提示错误信息要求重新输入

Else #不是以上结果则执行下面的语句

s=0 i=1 #给变量初始化赋值

While [$i-le $nu] #因为当输入的数字小于100都要执行相加, so I stop the loop when I is greater than this number

Do

s=$ (expr $s + $i) #s从0开始, I start with 1, assign the result of each loop to s and then continue and I add, always add to the input integer

Let i++ #每循环一次i +1

Done

echo "1-$nu integer and is: $s" #将结果输出, Stop the Loop

Break

Fi

Done

Validation results:

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/54/2E/wKioL1R7MfWAZ1CyAAB08G23yhM870.jpg "style=" float: none; "title=" 1.jpg "alt=" Wkiol1r7mfwaz1cyaab08g23yhm870.jpg "/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/54/2F/wKiom1R7MW6S_F39AADdp8_Przk488.jpg "style=" float: none; "title=" 2.jpg "alt=" Wkiom1r7mw6s_f39aaddp8_przk488.jpg "/>

Two

VI tar.sh

#!/bin/bash

# This is test

read-p "Please enter the compressed file you want to unzip:" F #将输入的文件名称赋值给变量f

s=$ (File $f | awk ' {print $} ') #判断这个文件是哪种格式的压缩文件

Case $s in #若结果为gzip则用gzip解压

Gzip

echo "will unzip the file with the Gzip tool"

TAR-ZVXF $f

;;

bzip2) #若结果为bzip2则用bzip2解压

echo "will use the bZIP tool to extract the file"

TAR-JXVF $f

;;

*)   #其他结果则表示不是压缩文件, screen output error message

echo "is not a standard compressed file"

Esac

Validation results:

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/54/2F/wKiom1R7MsfwhzwCAACua4h6qqQ132.jpg "title=" 3.jpg " alt= "Wkiom1r7msfwhzwcaacua4h6qqq132.jpg"/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/54/2E/wKioL1R7Mx-RZ0kdAAB1-lNr3n4072.jpg "style=" float: none; "title=" 4.jpg "alt=" Wkiol1r7mx-rz0kdaab1-lnr3n4072.jpg "/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/54/2E/wKioL1R7MyDTmnA-AABPeP6JQWY959.jpg "title=" 6.jpg " Style= "Float:none;" alt= "wkiol1r7mydtmna-aabpep6jqwy959.jpg"/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/54/2F/wKiom1R7MpeQCCqaAAC3tXWzTrc537.jpg "style=" float: none; "title=" 5.jpg "alt=" Wkiom1r7mpeqccqaaac3txwztrc537.jpg "/>

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2 Simple shell scripts (if,while,case statements)