Shell脚本-Demo-29例
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【例子:001】判断输入为数字，字符或其他
1.#!/bin/bash
2.read -p "Enter a number or string here:" input
3.case $input in
4. [0-9]) echo -e "Good job, Your input is a numberic! \n" ;;
5.[a-zA-Z]) echo -e "Good job, Your input is a character! \n" ;;
6. *) echo -e "Your input is wrong, input again! \n" ;;
7.esac
【例子:002】求平均数
1.#!/bin/bash
2.# Calculate the average of a series of numbers.
3.SCORE="0"
4.AVERAGE="0"
5.SUM="0"
6.NUM="0"
7.while true; do
8. echo -n "Enter your score [0-100%] ('q' for quit): "; read SCORE;
9. if (("$SCORE" < "0")) || (("$SCORE" > "100")); then
10. echo "Be serious. Common, try again: "
11. elif [ "$SCORE" == "q" ]; then
12. echo "Average rating: $AVERAGE%."
13. break
14. else
15. SUM=$[$SUM + $SCORE]
16. NUM=$[$NUM + 1]
17. AVERAGE=$[$SUM / $NUM]
18. fi
19.done
20.echo "Exiting."
【例子:003】自减输出
1.[scriptname: doit.sh]
2.while (( $# > 0 ))
3.do
4. echo $*
5. shift
6.done
7./> ./doit.sh a b c d e
8. a b c d e
9. b c d e
10.c d e
11.d e
12.e
【例子:004】在文件中添加前缀
1.# 人名列表
2.# cat namelist
3.Jame
4.Bob
5.Tom
6.Jerry
7.Sherry
8.Alice
9.John
10.# 脚本程序
11.# cat namelist.sh
12.#!/bin/bash
13.for name in $(cat namelist)
14.do
15. echo "name= " $name
16.done
17.echo "The name is out of namelist file"
18.# 输出结果
19.# ./namelist.sh
= Jame
= Bob
= Tom
= Jerry
= Sherry
= Alice
= John
【例子:005】批量测试文件是否存在
1.[root@host ~]# cat testfile.sh
2.#!/bin/bash
3.for file in test*.sh
4.do
5. if [ -f $file ];then
6. echo "$file existed."
7. fi
8.done
9.[root@host ~]# ./testfile.sh
10.test.sh existed.
11.test1.sh existed.
12.test2.sh existed.
13.test3.sh existed.
14.test4.sh existed.
15.test5.sh existed.
16.test78.sh existed.
17.test_dev_null.sh existed.
18.testfile.sh existed.
【例子:005】用指定大小文件填充硬盘
1.[root@host ~]# df -ih /tmp
2.Filesystem Inodes IUsed IFree IUse% Mounted on
3./dev/mapper/vg00-lvol5
4. 1000K 3.8K 997K 1% /tmp
5.[root@host ~]# cat cover_disk.sh
6.#!/bin/env bash
7.counter=0
8.max=3800
9.remainder=0
10.while true
11.do
12. ((counter=counter+1))
13. if [ ${#counter} -gt $max ];then
14. break
15. fi
16. ((remainder=counter%1000))
17. if [ $remainder -eq 0 ];then
18. echo -e "counter=$counter\tdate=" $(date)
19. fi
20. mkdir -p /tmp/temp
21. cat < testfile > "/tmp/temp/myfile.$counter"
22. if [ $? -ne 0 ];then
23. echo "Failed to write file to Disk."
24. exit 1
25. fi
26.done
27.echo "Done!"
28.[root@host ~]# ./cover_disk.sh
29.counter=1000 date= Wed Sep 10 09:20:39 HKT 2014
30.counter=2000 date= Wed Sep 10 09:20:48 HKT 2014
31.counter=3000 date= Wed Sep 10 09:20:56 HKT 2014
32.cat: write error: No space left on device
33.Failed to write file to Disk.
34.dd if=/dev/zero of=testfile bs=1M count=1