linux的shell脚本实验报告

第二次实验内容一、实验名称：Linux下shell编程二、实验类型：设计三、实验目的：1．熟悉Linux的shell几种变量使用2．熟练掌握Linux的shell编程几种结构3．熟练掌握Linux下shell脚本的编写四、实验准备参考教材，课件第7章内容及笔记。

要求实验内容全部写到实验报告上（B5纸）。

五、实验内容1. 练习使用shell四种变量，参考课件例题。

用户自定义变量，环境变量，位置变量，特殊变量这四种变量类型的使用，书中有例题。

2. 调试课件所有shell脚本的例题。

3. 编写如下脚本：●编写脚本if1，测试其功能。

echo -n "word 1: "read word1echo -n "word 2: "read word2if test "$word1" = "$word2"thenecho "Match"fiecho "End of program."●编写脚本chkargs，测试其功能if test $# -eq 0thenecho "You must supply at least one argument."exit 1fiecho "Program running."●编写脚本if2，测试其功能if test $# -eq 0thenecho "You must supply at least one argument."exit 1fiif test -f "$1"thenecho "$1 is a regular file in the working directory"elseecho "$1 is NOT a regular file in the working directory"fi●编写脚本if3，测试其功能echo -n "word 1: "read word1echo -n "word 2: "read word2echo -n "word 3: "read word3if [ "$word1" = "$word2" -a "$word2" = "$word3" ]thenecho "Match: words 1, 2, & 3"elif [ "$word1" = "$word2" ]thenecho "Match: words 1 & 2"elif [ "$word1" = "$word3" ]thenecho "Match: words 1 & 3"elif [ "$word2" = "$word3" ]thenecho "Match: words 2 & 3"elseecho "No match"fi●编写smartzip 脚本，测试其功能#!/bin/bashftype=`file "$1"`case "$ftype" in"$1: Zip archive"*)unzip "$1" ;;"$1: gzip compressed"*)gunzip "$1" ;;"$1: bzip2 compressed"*)bunzip2 "$1" ;;*) echo "File $1 can not be uncompressed with smartzip";;esac●编写脚本dirfiles，测试其功能。

for i in *doif [ -d "$i" ]thenecho "$i"fidone●编写脚本until1，测试其功能。

用while改写之。

secretname=jennyname=nonameecho "Try to guess the secret name!"echountil [ "$name" = "$secretname" ]//while改写位 while [ “$name” !=“$secretname” ],其他地方不变doecho -n "Your guess: "read namedoneecho "Very good."●编写脚本brk,测试其功能。

for index in 1 2 3 4 5 6 7 8 9 10doif [ $index -le 3 ] ; thenecho "continue"continuefi#echo $index#if [ $index -ge 8 ] ; thenecho "break"breakfidone●编写脚本command_menu，测试其功能。

echo -e "\n COMMAND MENU\n"echo " a. Current date and time"echo " b. Users currently logged in"echo " c. Name of the working directory"echo -e " d. Contents of the working directory\n"echo -n "Enter a, b, c, or d: "read answerechocase "$answer" ina)date;;b)who;;c)pwd;;d)ls;;*)echo "There is no selection: $answer";;esac●编写脚本demo_shift，测试其功能。

echo "arg1= $1 arg2= $2 arg3= $3"shiftecho "arg1= $1 arg2= $2 arg3= $3"shiftecho "arg1= $1 arg2= $2 arg3= $3"shiftecho "arg1= $1 arg2= $2 arg3= $3"shift●编写shell脚本sum1，求命令行上整数和。

即：$./sum1 5 12 4 6，给出和的结果。

sum=0for i in $*dolet sum=sum+idoneecho “和是:$sum”●编写脚本filetest，判断当前目录下所有文件类型，如果是普通文件，显示文件内容；如果是目录文件，显示目录列表；如果是大小为0的文件，删除它；否则，显示“sorry， The file is not recognized!”for i in *do if [ -d $i ]thenls $ielif [ -f $i ]then if [ -s $i ]then cat $ielse rm $ifielseecho –n “sorry,the file can’t be recognized”fidone●编写shell脚本user，判断当前登录用户是否为“学号命名”的用户，是，提示：hello “学号用户”,welcome!，否，提示“you should login using your username! ”Read nameIf [ $USER = $name ]Then echo “hello $USER”else echo “you should login using your username!”fi●编写shell脚本menu，使用shell编写一个菜单，分别实现列出以下内容：（1）显示目录内容、（2）切换目录、（3）创建文件、（4）编辑文件、（5）删除文件的●功能。

在此例中将用到循环语句、分支语句和输入输出语句。

Echo “a.display the directory”Echo “b.change the directory”Echo “c.create a file”Echo “d.delete the file”Echo “if you input nothing,you will exit”Read itemUntil [ -z $item ]DoCase $item ina)Echo “input the directory”Read direLs $dire;;b)Echo “input the directory you want go into”Read direCd $dire;;c)Echo “input the file you want to create”Read fTouch $f;;d)Echo “input the file you want to delete”Read fRm $f;;EsacEcho “a.display the directory”Echo “b.change the directory”Echo “c.create a file”Echo “d.delete the file”Echo “if you input nothing,you will exit”Read itemdone编写脚本，实现一个简单计算器。

+ addition- subtractionx multiplication/ division脚本执行形式：$ ./cal.sh 21 / 3Let l=$1 //最简单的一种形式，而且还特别高效Echo $1;第二种方式：Re=”+ - \* /”For var in $reDoIf [ $var = “\*” ]ThenNum2=${1#*\*}Num1=${1%\**}ElseNum2=${1#*$var}Num1=${1#%$var*}FiIf [ $num1 =$1 ]Then continueFiCase $var in“+”) let num=num1+num2Break;;“-“) let num=num1-num2;Break;;“\*”)let num=num1*num2Break;;“/”)let num=num1/num2Break;;EsacDoneEcho $num六、实验总结。