shell 脚本实例

1. 写一个脚本，利用循环计算10的阶乘

#!/bin/sh

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factorial=1

for a in `seq 1 10`
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do51Testing软件测试网5i(OL5m;z+C rHcD

       factorial=`expr $factorial \* $a`

done

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echo "10! = $factorial"51Testing软件测试网 |Oj9J(xc

4R*`DK)Ap051Testing软件测试网n2NH`
T&UR

注：上面有一行，for a in `seq 1 10`,其中seq 1 10 , 即列出现1到10之间所有的数字，这一行也可改为：for a in "1 2 3 4 5 6 7 8 9 10"
q9d
R+`$}(j051Testing软件测试网,ysx#IC2?8Pv4gc6pW

2. 写一个脚本，执行后，打印一行提示“Please input a number:"，要求用户输入数值，然51Testing软件测试网&F5Q9Fj-u7V.y
后打印出该数值，然后再次要求用户输入数值。直到用户输入"end"停止。

#!/bin/sh

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unset var

while [  "$var" != "end" ]

do

     echo -n "please input a number: "51Testing软件测试网LPU0DJ4X C%a K

     read var

     if [ "$var" = "end" ]51Testing软件测试网&s%rY4_7yV4V4?8V2W

     then51Testing软件测试网)M%I k~4{T&K4AM!Bw

         break

     fi

     echo "var is $var"

done51Testing软件测试网wO |,z|H^%c2?c*r

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3. 写一个脚本，利用循环和continue关键字，计算100以内能被3整除的数之和

#!/bin/sh51Testing软件测试网wa|$a8o @g

 51Testing软件测试网0pkt8TmLj]0_.?%G

sum=0

for a in `seq 1 100`51Testing软件测试网5Ws|s9|#F7x:U

do

     if [ `expr $a % 3` -ne 0 ]

     then

          continue

     fi51Testing软件测试网_;Z'@*O5j-H

     echo $a

     sum=`expr $sum + $a`

done51Testing软件测试网E&i"ep4~Lp

echo "sum = $sum"51Testing软件测试网^9MSGC%@

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4．一个函数，利用shift计算所有参数乘积，假设参数均为整数
g
UH0lX-O2v4{d2z0

#! /bin/sh51Testing软件测试网B.k iv+^\9| ?K

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result=1

while [ $# -gt 0 ]51Testing软件测试网|kb6B _ sNW#M,Q!y

do51Testing软件测试网;LA7@]ND o)_

     result=`expr $result \* $1`

     shift51Testing软件测试网%` L
U:C"^ S`'L

done

echo $result

 51Testing软件测试网2e#S#`['H*e

5．写一个脚本，可以根据参数文件名，以正确的参数调用tar来解压缩tar.gz或tar.bz2文件。

#!/bin/sh51Testing软件测试网yKT}4@%b8PBr-j

case ${1##*.tar.} in 51Testing软件测试网T+|#KT'X2V7X4enV

     bz2)51Testing软件测试网FK`-UA g#z

         tar jxvf $1

         ;;

     gz)

         tar zxvf $151Testing软件测试网~$`S)\b)uN!Ci

         ;;51Testing软件测试网9jWu`5OHV`|

     *)

         echo "wrong file type"51Testing软件测试网:D.uf Zu

esac

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6．写一个脚本以方便用户查询rpm的相关信息。这个脚本首先提示用户选择查询依据，比如

rDMv0}_N2p0文件名，包名，全部等。然后提示用户选择查询信息，比如包名，包里所包含的所有文件，51Testing软件测试网L J
h`$M,m-vp5l
包的信息等。然后询问是否继续查询，是则循环刚才的过程，否则退出。

#!/bin/sh51Testing软件测试网,^~(LV w$AlN

RPM=/bin/rpm51Testing软件测试网w-]9D Cs2em6S

option="-q"

while true

do

       echo "what to query?"51Testing软件测试网l)y6Eb9f9|4zb

       select var in  "All" "file" "package name" 51Testing软件测试网PR'y5S?/c3|'t

       do51Testing软件测试网},\5_f:D?wg"l

              case $var in51Testing软件测试网r.nv1\+Biw:a J({

              All)

                     option=$option"a"51Testing软件测试网#x)sD%sg9o;b of'x

                     break51Testing软件测试网+G.X%|8Y L5z1[

                     ;;51Testing软件测试网q,?"g8Un;]n

              file)51Testing软件测试网tpe hy"{)F*}

                     echo -n "please input file name: "51Testing软件测试网+gaYW.v V

                     option=$option"f"

                     read argument51Testing软件测试网rQD
k.cEq

                     break51Testing软件测试网#fIwn/d+a:U

                     ;;

              package\ name)51Testing软件测试网c-K1Oq
Z!D2h'I yIh

                     echo -n "please input package name: "51Testing软件测试网ded4lG)r;|

                     read argument51Testing软件测试网+C8Wi"Z'vh

                     break51Testing软件测试网!o6Q$BA)J2V%A@

                     ;;

              *)51Testing软件测试网 I&_RW~0y&B

                     echo "please choose between 1-3"

                     ;;

              esac51Testing软件测试网]!\P1Uc{@7j1YZ;XH

       done

       echo "what do you want to know?"51Testing软件测试网6~|jSgu0s

       select var in "location" "info" "package name"51Testing软件测试网-g H-d:t0Nku}L

       do

              case $var in

              location)51Testing软件测试网+G
Zd7E'Px5lpT

                     option=$option"l"51Testing软件测试网Ozt+r:@o:|v7ZfE

                     break

                     ;;51Testing软件测试网m9}8Pu+e9d3ko

              info)

                     option=$option"i"

                     break51Testing软件测试网H-?7Qq?R:~H

                     ;;

              package\ name)

                     break

                     ;;51Testing软件测试网ilF8i{

              *)51Testing软件测试网w8F$P,O;A*fD

                     echo "please choose between 1-3"51Testing软件测试网tE)B?K \r @%w*{

                     ;;

              esac

       done

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       ${RPM}  $option $argument

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       echo "continue? [yes/no]"

       read answer

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       if [ answer = "no" ]

       then51Testing软件测试网:X;Y`4W2P)R'}

              break51Testing软件测试网o6H]rz

       fi

done