four.day_shell监控

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[root@web01 /etc/init.d]# cat rsyncd
#!/bin/bash
# chkconfig: 2345 21 81
# description: startup rsync scripts

if [ "$1" = "start"  ]
then
   if [ -f /var/run/rsyncd.pid -a -s /var/run/rsyncd.pid ]
   then
       :
   else
       rsync --daemon
   fi
elif [ "$1" = "stop"  ]
then
    if [ -f /var/run/rsyncd.pid -a -s /var/run/rsyncd.pid ]
    then
        kill `cat /var/run/rsyncd.pid`
    else
        echo "Failed to stop rsync Unit rsync not loaded."
        exit 1
    fi
elif [ "$1" = "restart"  ]
then
    if [ -f /var/run/rsyncd.pid -a -s /var/run/rsyncd.pid ]
    then
        kill `cat /var/run/rsyncd.pid`
    fi
   sleep 2

   if [ -f /var/run/rsyncd.pid -a -s /var/run/rsyncd.pid ]
   then
       :
   else
       rsync --daemon
   fi
else
    echo "Usage；$0 {start|stop|restart}"
fi
[root@web01 /etc/init.d]# cat rsyncd1
#!/bin/bash
# chkconfig: 2345 21 81
# description: startup rsync scripts
start(){
    if [ -f /var/run/rsyncd.pid -a -s /var/run/rsyncd.pid ]
       then
           :
       else
           rsync --daemon
    fi
}
stop(){
    if [ -f /var/run/rsyncd.pid -a -s /var/run/rsyncd.pid ]
    then
        kill `cat /var/run/rsyncd.pid`
    else
        echo "Failed to stop rsync Unit rsync not loaded."
        exit 1
    fi

}

if [ "$1" = "start" ]
then
   start
elif [ "$1" = "stop" ]
then
   stop
elif [ "$1" = "restart" ]
then
   $0 stop
   sleep 2
   $0 start
else
    echo "Usage；$0 {start|stop|restart}"
fi
[root@web01 /etc/init.d]# cat rsyncd2
#!/bin/bash
# chkconfig: 2345 21 81
# description: startup rsync scripts
start(){
    if [ -f /var/run/rsyncd.pid -a -s /var/run/rsyncd.pid ]
       then
           :
       else
           rsync --daemon
    fi
}
stop(){
    if [ -f /var/run/rsyncd.pid -a -s /var/run/rsyncd.pid ]
    then
        kill `cat /var/run/rsyncd.pid`
    else
        echo "Failed to stop rsync Unit rsync not loaded."
        exit 1
    fi

}
main(){
    if [ "$1" = "start" ]
    then
       start
    elif [ "$1" = "stop" ]
    then
       stop
    elif [ "$1" = "restart" ]
    then
       $0 stop
       sleep 2
       $0 start
    else
        echo "Usage；$0 {start|stop|restart}"
    fi
}
main $*

函数传参

[root@backup ~]# sh b.sh ppp
I am ppp
[root@backup ~]# cat b.sh 
oldboy(){
     echo "I am $1"
}
oldboy $1 
[root@backup ~]# sh a.sh 
I am ooo
[root@backup ~]# cat a.sh 
oldboy(){
     echo "I am $1"
}
oldboy ooo

[root@web01 /server/scripts]# cat check_url1.sh
#!/bin/sh
wget -q 127.0.0.1 &>/dev/null
retval=$?
if [ $retval -eq 0 ]
then
   echo "url is ok."
else
   echo "url is no."
fi

改成传参：
[root@web01 /server/scripts]# cat check_url2.sh 
#!/bin/sh
wget -q $1 &>/dev/null
retval=$?
if [ $retval -eq 0 ]
then
   echo "url is ok."
else
   echo "url is no."
fi

专业写法：
[root@web01 /server/scripts]# cat check_url3.sh 
#!/bin/sh
check_url(){
wget -q $1 &>/dev/null
retval=$?
if [ $retval -eq 0 ]
then
   echo "url is ok."
else
   echo "url is no."
fi
}
main(){
    check_url $1
}
main $*

[root@web01 /server/scripts]# sh check_url3.sh 127.0.0.1
url is ok.

[root@web01 /server/scripts]# cat check_url3.sh 
#!/bin/sh
usage(){
    if [[ ! $1 =~http://www.*com ]]
    then
        echo "Usage:$0 http://www.xx.com"
        exit 1
    fi
}
check_url(){
wget -q $1 &>/dev/null
retval=$?
if [ $retval -eq 0 ]
then
   echo "url is ok."
else
   echo "url is no."
fi
}
main(){
    usage $1
    check_url $1
}
main $*



[root@web01 /server/scripts]# sh check_url4.shhttp://www.baidu.com
url is ok.                                                 [  确定  ]
[root@web01 /server/scripts]# cat check_url4.sh 
#!/bin/sh
[ -f /etc/init.d/functions ] && . /etc/init.d/functions

usage(){
    if [[ ! $1 =~ http://www.*com ]]
    then
        echo "Usage:$0http://www.xx.com"
        exit 1
    fi
}
check_url(){
wget -q $1 &>/dev/null
retval=$?
if [ $retval -eq 0 ]
then
  action  "url is ok." /bin/true
else
  action "url is no." /bin/false
fi
}
main(){
    usage $1
    check_url $1
}
main $*