linux下简单shell脚本例子

一些自己练习时所写的简单shell脚本

（centos 6.3）【复制粘贴时请注意空格、引号、分号等格式】

1、 使用for循环、while循环、until循环计算100以内所有偶数的和 for循环： #!/bin/sh Sum=0

for i in `seq 0 2 100` do done

echo “SUM=$Sum” exit 0

while循环： #!/bin/sh Sum=0 i=0

while [ “$i” –le 100 ] do done

echo “SUM=$Sum” exit 0

until循环： #!/bin/sh Sum=0 i=0

until [ “$i” –gt 100 ] do done

echo “SUM=$Sum” exit 0

2、 通过循环实现从1开始叠加，直到和的结果大于2000为止（使用break循环控制符） #!/bin/sh Sum=0 for (( i=1;;i++) do

let “Sum+=i”

if [ “$Sum” –gt 2000 ] then

echo “i=$i” echo “SUM=$Sum” break let “Sum+=i” let “i+=2” let “Sum+=i” let “i+=2” let “Sum+=i”

#也可用for i in $(seq 0 2 100) #或者 for (( i=0;i<=100;i+=2 ))

done

fi

exit 0

3、 找出100以内所有能被3整除的数，每行显示8个数，然后换行显示 #!/bin/sh times=0

#循环次数

for i in $(seq 1 100)

do let “temp=i%3” let “times++” if [ “$temp” –eq 0 ] then printf “$i” let “a=times%8” if [ “$a” –eq 0 ] then printf “\\n” fi

fi

done printf “\\n” exit 0

4、 打印九九乘法表 #!/bin/sh

for (( i=1;i<=9;i++) do for (( j=1;j<=i;j++ )) do let “temp=i*j”

echo –n “$j*$i=$temp “ done echo “”

done exit 0

5、 显示颜色类型，并让用户选择（使用select结构）#!/bin/sh

echo “What is your favorite color?”

select color in “red” “blue” “green” “white”do break

done

echo “You have selected $color.” exit 0

6、 显示当前工作目录下的文件数和目录数 #!/bin/sh

Number() { let “dir_number=0”

let “file_number=0” black” “ done

ls echo “”

for file in `ls` do

if [ -d “$file” ] then then fi

let “file_number+=1” let “dir_number+=1” elif [ -f “$file” ]

echo “The number of dirs is $dir_number.” echo “The number of files is $file_number.” }

Number exit 0

7、 打印下面图案： * ** *** **** ***** ****** ******* ******** ********* **********

#!/bin/sh

for (( i=1;i<=10;i++ )) do done exit 0

8、 输入一个整数，判断是否为完数（完数：一个数恰好等于它的因子之和，如6=1+2+3） #!/bin/sh sum=0

echo “Please input a number(>1):” read number

for (( i=1;i<$number;i++ )) do done

let “temp=$number%i” if [ “$temp” –eq 0 ] then fi

let “sum+=i” for (( j=1;j<=i;j++ )) do done printf “\\n”

echo –n “*”

if [ “$number” –eq “$sum” ] then

echo “$number is Perfect number!” else fi exit 0

9、 输入一个数字（1-12），然后显示其对应的月份的英文(使用case结构) #!/bin/sh

echo “Please input a month(1-12):” read month

case “$month” in 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) *) esac exit 0

10、 输入一个年份，判断是否为闰年，判断条件：

（1） （2） #!/bin/sh

echo “Please input a year:” read year

#设置取余参数 let “n1=$year%4” let “n2=$year0” let “n3=$year@0”

能被4整除，但不能被100整除的年份都是闰年； 能被100整除，但又能被400整除的年份是闰年。

echo “The month is not in (1-12)!”;; echo “The month is December!”;; echo “The month is November!”;; echo “The month is October!”;; echo “The month is September!”;; echo “The month is Augest!”;; echo “The month is July!”;; echo “The month is June!”;; echo “The month is May!”;; echo “The month is April!”;; echo “The month is March!”;; echo “The month is February!”;; echo “The month is January!”;;

echo “$number is not Perfect number!”

if [ ! “$n1” –eq 0 ] then then then else fi

if [ “$leap” –eq 1 ] then else fi exit 0

暂时就这些吧，都是挺简单的例子。

我也是初学者，有误的地方欢迎指出，欢迎交流，共同学习！ 邮箱：nowhere789@yahoo.cn

echo “$year is not a leap year!” echo “$year is a leap year!” leap=1 leap=0 leap=1

elif [ ! “$n3” –eq 0 ]

leap=0

elif [ ! “$n2” –eq 0 ]

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