15个精典SHELL编程例子

2011 年 12 月
一	二	三	四	五	六	日
	1	2	3	4
5	6	7	8	9	10	11
12	13	14	15	16	17	18
19	20	21	22	23	24	25
26	27	28	29	30	31

1.输出 1
1 2
1 2 3
1 #!/bin/bash
2 echo "Please type your number:"
3 read a
4 for ((i=1;i<=a;i++))
5 do
6 for ((p=1;p<=i;p++))
7 do
8 echo -n " $p "
9 done
10 echo
11 done
12 echo
2.九九乘法表
1 #!/bin/bash
2 for ((i=1;i<10;i++))
3 do
4 for ((p=1;p<=i;p++))
5 do
6 echo -ne " $p x $i= "`expr $i \* $p`
7 done
8 echo
9 done
10 echo
3.计算器
1 #!/bin/bash
2 while true
3 echo "..............+"
4 echo "..............-"
5 echo "..............x"
6 echo "............../"
7 echo "..............q"
8
9 echo "Please type your word:(e.g.1 + 2)"
10 read a b c
11
12 do
13 case $b in
14 +) echo " $a + $c =" `expr $a + $c`;;
15 -) echo " $a - $c =" `expr $a - $c`;;
16 x) echo " $a x $c =" `expr $a \* $c`;;
17 /) echo " $a / $c =" `expr $a \/ $c`;;
18 esac
19
20 case $a in
21 q) break ;;
22
23 esac
24 done
4.菱形
1 #!/bin/bash
2 echo "Please type a number:"
3 read num
4 for ((i=1;i<=num;i++))
5 do
6 for ((j=0;j<num-i;j++))
7 do
8 echo -n " "
9 done
10 for ((j=0;j<2*i-1;j++))
11 do
12 echo -n "*"
13 done
14 echo ""
15 done
16 for ((i=1;i<=num;i++))
17 do
18 for ((j=0;j<i;j++))
19 do
20 echo -n " "
21 done
22 for ((j=0;j<2*(num-i)-1;j++))
23 do
24 echo -n "*"
25 done
26 echo ""
27 done
5. 输出当前目录下所有文件，并输出文件总数和目录总数
1 #!/bin/bash
2
3 ls -al
4 filenum=0
5 dirnum=0
6 for q in `ls -a`
7 do
8 if [ -d $q ]
9 then
10 dirnum=`expr $dirnum + 1`
11 fi
12 filenum=`expr $filenum + 1`
13 done
14 echo "The number of dirctary is $dirnum"
15 echo "The number of file is $filenum"
6.菜单
1 #!/bin/bash
2 while true
3 echo "List Directory..........l "
4 echo "Change Directory........c "
5 echo "Edit File...............e "
6 echo "Remove File.............r "
7 echo "Exit Menu...............q "
8 read ch
9 do
10 case $ch in
11 l) ls;;
12 c) echo Enter target directory
13 read direc
14 cd "$direc"
15 ;;
16 e) echo Enter file name
17 read file
18 vi $file
19 ;;
20 r) echo Enter file name
21 read file
22 rm $file
23 ;;
24 q|Q) echo Goodbye
25 break;;
26 *) echo illegal Option
27 esac
28 done
7. ./shuru a b c d e f
1 #!/bin/bash
2 for (( b=$#; b>0; b-- ))
3 do
4 echo $*;
5 shift;
6 done
8.电话本
1 #!/bin/bash
2 if [ ! -f /root/minda ]
3 then
4 touch /root/minda
5 fi
6 while true
7 echo "If you want to add a user plese type----------------------a"
8 echo "If you want to del a user plese type----------------------d"
9 echo "If you want to watch all users please type----------------l"
10 echo "If you want to bianji users please tyye-------------------e"
11 echo "If you want to exit please type---------------------------q"
12 read b
13 do
14 case $b in
15 a) echo "Please type your name :"
16 read name
17 echo "Please type your number :"
18 read number
19 echo $name $number >> /root/minda;;
20 d) echo "Please type which name do you want to del:"
21 read name
22 cat /root/minda|grep ^[^$name]> /root/minda;;
23 l) cat /root/minda;;
24 e) echo "Please type which name do you want to del:"
25 read name
26 cat /root/minda|grep ^[^$name]> /root/minda
27 echo "Please type your new name :"
28 read name
29 echo "Please type your new number :"
30 read number
31 echo $name $number >> /root/minda;;
32 q) exit;;
33 esac
34 done
9.判断当前用户的类型
1 #!/bin/bash
2 case $UID in
3 0) echo this is root;;
4 [0-9][0-9]) echo this is system;;
5 [1-4][0-9][0-9]) echo this is service;;
6 *) echo this is public;;
7 esac
10.计算1-100的和
1 #!/bin/bash
2 b=0
3 for ((a=1;a<=100;a++))
4 do
5 b=`expr $b + $a `
6 done
7 echo b= $b
11.用一个文件记录系统中所有rpm包名，如果文件不存在则创建，如果存在则显示文件内容。
1 #!/bin/bash
2 a=/root/file
3 if [ -f $a ]
4 then
5 cat $a
6 else
7 rpm -qa > $a
8 fi
12.用户登陆
1 #!/bin/bash
2 n=1
3 while [ $n -gt 0 ]
4 do
5 echo "xinjian------------------1"
6 echo "denglu-------------------2"
7 echo "exit---------------------3"
8 read n;
9 case $n in
10 1) echo "username"
11 read name
12 if [ -f $name ]
13 then
14 echo "same username"
15 else
16 touch /root/$name
17 echo "passwd"
18 read passwd
19 echo $passwd >> /root/$name
20 fi;;
21 2) echo "username"
22 read name1
23 if [ -f $name1 ]
24 then
25 echo "passwd"
26 else
27 echo "yonghu wrong"
28 fi
29 read passwd1
30 if [ $passwd1 -eq `cat /root/$name1` ]
31 then
32 echo "success"
33 break
34 else
35 echo "passwd wrong"
36 fi;;
37 3) break;;
38 esac
39 done
13.创建四个文件test1，test2，test3，test4，实现自动创建dir1,dir2,dir3,dir4四个目录，并将test1，test2，test3，
test4四个文件分别拷贝到dir1,dir2,dir3,dir4相应的目录下。
1 #!/bin/bash
2 for a in 1 2 3 4
3 do
4 touch test$a
5 mkdir dir$a
6 cp test$a dir$a
7 done
14.输入任意数求和./a.out 1 2 3 4 5 6
1 #!/bin/bash
2 s=0
3 for i in $*
4 do
5 s=`expr $s + $i`
6 done
7 echo $s

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