第五章流程控制之case語句

case 變·量 in 模式一）命令序列1 ；；模式二）命令序列2 ；；... *) 無匹配後命令序列

esac

#判斷使用者的型別
[root@db04 /scripts/day05]# vim user.sh 
#!/bin/bash
# author:jh
# time:2020-11-20 10:39:42
# name:user.sh
# version: 1.0
# discription: to 
read -p "please input user name:" name
[ -z "$name" ] && echo "the user name must exist" && exit
case $name in
"root")
echo "admin"
;;"jh")
echo "com user"
;;*) echo "other user"
esac
[root@db04 /scripts/day05]# chmod +x user.sh

#編寫nginx啟動指令碼
[root@db04 /scripts/day05]# vim nginx.sh 
#!/bin/bash
# author:jh
# time:2020-11-20 11:02:54
# name:nginx.sh
# version: 1.0
# discription: to 
[ $# -ne 1 ] && echo "usage: $0 " && exit
function start() 
function stop()
case $1 in
"start")
start
;;"stop")
stop
;;"restart")
stop
start
;;"reload")
stop
start
;;"status")
ps aux |grep [n]ginx |grep -q master
if [ $? -eq 0 ];then
echo "nginx is up"
else
echo "ngins is down"
fi;;
*) echo "usage: $0 "
esac
[root@db04 /scripts/day05]# chmod +x nginx.sh

[root@jh shell]# vim nginx_stat.sh
#!/bin/bash
. /etc/init.d/functions
if [ $# -ne 1 ]
then
echo "usage $0 "
exit 1
fiif [ "$1" == "start" ]
then
action "start nginx" /bin/true
elif [ "$1" == "stop" ]
then
action "stop nginx" /bin/true
elif [ "$1" == "restart" ]
then
action "restart nginx" /bin/true
else
echo "usage $0 "
exit 1
fi[root@jh shell]# chmod +x nginx_stat.sh
[root@jh shell]# ./nginx_stat.sh start
start nginx [ 確定 ]
[root@jh shell]# ./nginx_stat.sh restart
restart nginx [ 確定 ]
[root@jh shell]# ./nginx_stat.sh
usage ./nginx_stat.sh

# 儲備知識1
netstat -lntup|grep  ":80\b"  # \b錨定單詞的結尾
# 儲備知識2
action:列印一段資訊並執行給定的命令，然後根據給定命令的執行的結果來呼叫 success,failure方
法，確定最終顯示的內容
[root@jh shell]# action "nginx start is" :
nginx start is                       [  確定 ]
[root@jh shell]# action "nginx start is" /bin/true
nginx start is                       [  確定 ]
[root@jh shell]# action "nginx start is" /bin/false
nginx start is                       [失敗]
# **
[root@jh shell]# vim nginx_stat.sh
#!/bin/bash
. /etc/init.d/functions
args=$1
fun()
case $1 in
start)
netstat -lntup|grep  ":80\b" &>/dev/null
if [ $? -eq 0 ]
then
echo "nginx is runing..."
else
/usr/sbin/nginx
funfi
;;stop)
/usr/sbin/nginx -s stop
fun;;
reload)
/usr/sbin/nginx -s reload
fun;;
restart)
netstat -lntup|grep  ":80\b" &>/dev/null
if [ $? -ne 0 ]
then
/usr/sbin/nginx
[ $? -eq 0 ] && echo "nginx start is ok" || echo "nginx start is
failed"
else
/usr/sbin/nginx -s stop              
[ $? -eq 0 ] && echo "nginx stop is ok" || echo "nginx stop is failed"
sleep 2
/usr/sbin/nginx
funfi
;;status)
netstat -lntup|grep  ":80\b" &>/dev/null
if [ $? -eq 0 ]
then
echo "nginx is runing ..."
else
echo "nginx is not runing ..."
fi;;
*)echo "usage: $0 "
exit 2
esac

#編寫乙個簡易跳板機指令碼 # 儲備知識 linux中斷訊號區別為：鍵入不同、對應操作不同、啟用不同。 1、hup中斷訊號：hup中斷訊號的對應操作為讓程序掛起，睡眠。同2、int中斷訊號：int中斷訊號的對應操作為正常關閉所有程序。同3、term中斷訊號 15：term中斷訊號的對應操作為正常的退出程序。 4、kill中斷訊號 9：kill中斷訊號的對應操作為強制關閉程序。 5、stop 19暫停（同 ctrl + z） 6、cont 18繼續（與stop相反， fg/bg命令） 7、tstp中斷訊號：tstp中斷訊號的對應操作為暫時停用程序。 # ** [root@jh shell]# cat jumpserver.sh #!/bin/bash cat<1. backup 10.0.0.41 2. web02 192.168.12.21 3. web03 10.0.0.9 eoftrap "echo 不要亂按鍵盤,否則伺服器將會**" hup int tstp while true do read -p "請輸入連線主機編號資訊: " num read -p "請輸入賬號: " user case $num in 1)ssh [email protected] [ $? -ne 0 ] && echo "connect faild" ;;2) ssh [email protected] [ $? -ne 0 ] && echo "connect faild" ;;*) echo "請輸入連線主機資訊" esac

done

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