系统运维
case使用格式
case 值 in
模式1)
指令1
指令2
…
;;
模式2)
指令1
指令2
…
;;
esca
echo \\\’输入 1 到 4 之间的数字:\\\’
echo \\\’你输入的数字为:\\\’
read aNum
case $aNum in
1) echo \\\’你选择了 1\\\’
;;
2) echo \\\’你选择了 2\\\’
;;
3) echo \\\’你选择了 3\\\’
;;
4) echo \\\’你选择了 4\\\’
;;
*) echo \\\’你没有输入 1 到 4 之间的数字\\\’
;;
esac
实例 1
#!/bin/bash
#case…esac
echo "What is your preferred scripting language?"
echo "1) bash"
echo "2) prel"
echo "3) python"
echo "4) ruby"
echo "5) I do not know !"
read lang
case $lang in
1) echo "you selected bash" ;;
2) echo "you selected prel" ;;
3)
echo "you selected python"
;;
4)
echo "you selected ruby"
;;
5)
echo "I do not know!"
;;
esac
执行结果
[root@localhost shell]# sh case.sh
What is your preferred scripting language?
1) bash
2) prel
3) python
4) ruby
5) I do not know !
4
you selected ruby
[root@localhost shell]# sh case.sh
What is your preferred scripting language?
1) bash
2) prel
3) python
4) ruby
5) I do not know !
5
I do not know!
[root@localhost shell]#
实例 2
#!/bin/bash
echo -n "Do you agree whith this? [yes or no]: "
read yn
case $yn in
[Yy] | [Yy][Ee][Ss])
echo "Agreed."
;;
[Nn] | [Nn][Oo])
echo "Not Agreed."
exit 1
;;
*)
echo "Invalid input."
;;
esac
运行结果：
[root@localhost shell]# sh case2.sh
Do you agree whith this? [yes or no]: 1
Invalid input.
[root@localhost shell]# sh case2.sh
Do you agree whith this? [yes or no]: n
Not Agreed.
[root@localhost shell]# sh case2.sh
Do you agree whith this? [yes or no]: Yes
Agreed.
[root@localhost shell]#
实例 3
#!/bin/bash
case $1 in
sql) echo "Runing mysql backup using Mysqldump tool…"
;;
sync) echo "Runing backup using rsyuc tool…"
;;
git) echo "Runing backup using gistore tool…"
;;
tar) echo "Runing tape backup using tar tool…"
;;
*)
echo "Backup shell script utility"
echo "Usage: $0 {sql|sync|git|tar}"
echo " sql : Run MYSQL backup utility."
echo " sync : Run web backup utility."
echo " git : Run gistore backup utility."
echo " tar : Run tape backup utility."
;;
esac
运行结果：
[root@localhost shell]# sh case3.sh
Backup shell script utility
Usage: case3.sh {sql|sync|git|tar}
sql : Run mysql backup utility.
sync : Run web backup utility.
git : Run gistore backup utility.
tar : Run tape backup utility.
[root@localhost shell]# sh case3.sh sql
Runing mysql backup using mysqldump tool…
[root@localhost shell]#
实例 4
#!/bin/bash
#得到磁盘使用率最高的
max_usage=$(df -Ph |awk \\\'{print $5}\\\’|grep %|grep -v "Use"|sort -n|tail -1|cut -d "%" -f1)
max_dir=df -Ph | awk \\\'{print $5,$6}\\\'|grep -v Use|sort -n|tail -1|awk \\\'{print $2}\\\'
case ${max_usage} in
[1-6])
MSG="All is quiet.\\\\"${max_dir}\\\\" is ${max_usage}% used"
;;
[7-8])
MSG="Start thinking about cleaning out some stuff. "
MSG="$MSG There\\\’s a partition ${max_dir} is ${max_usage}% used."
;;
9[1-8])
MSG="Better hurry with that new disk… "
MSG="$MSG One partition ${max_dir} is ${max_usage}% used."
;;
99)
MSG="I\\\’m drowning herel There\\\’s a partiton at ${max_usage}% used"
;;
)
MSG="I seem to be runing with an nonexitent amount of disk space…"
;;
esac
#echo $MSG| mail -s "disk reportdate" root
echo $MSG
运行结果：
[root@localhost shell]# sh case4.sh
All is quiet."/" is 22% used
[root@localhost shell]#
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