linux运维初级班shell脚本编程****及参考****20110523

[root@oldboy-B scripts]# cat httpdctl
#!/bin/sh
#created by oldboy 20110523
#QQ 31333741
. /etc/init.d/functions
HTTPDPATH=/etc/init.d/httpd
if [ "$1" = "start" ];then
$HTTPDPATH $1 >/dev/null 2>&1
action "启动 httpd:" /bin/true
elif [ "$1" = "stop" ];then
$HTTPDPATH $1
elif [ "$1" = "restart" ];then
$HTTPDPATH $1 >/dev/null 2>&1
action "重起 httpd:" /bin/true
else
echo "用法： $0 {start|stop|restart}"
exit 1
fi
提示：注意action "启动 httpd:" /bin/true的用法

[root@oldboy-B scripts]# httpdctl stop
停止 httpd：[确定]
[root@oldboy-B scripts]# httpdctl start
启动 httpd: [确定]
[root@oldboy-B scripts]# httpdctl restart
重起 httpd: [确定]

-------------------------------------------------------
d.case语句实现方式

[root@oldboy-B scripts]# cat httpdctl
#!/bin/sh
#created by oldboy 20110523
#QQ 31333741
. /etc/init.d/functions
HTTPDPATH=/etc/init.d/httpd
case "$1" in
start)
$HTTPDPATH $1 >/dev/null 2>&1
action "启动 httpd:" /bin/true
;; 拥有帝国一切，皆有可能。欢迎访问phome.net
stop)
$HTTPDPATH $1
;;
restart)
$HTTPDPATH $1 >/dev/null 2>&1
action "重起 httpd:" /bin/true
;;
*)
echo "用法： $0 {start|stop|restart}"
esac

e.更专业的实现方法
[root@oldboy-B scripts]# cat httpdctl
#!/bin/sh
#created by oldboy 20110523
#QQ 31333741
[ -f /etc/init.d/functions ] && . /etc/init.d/functions

start() {
daemon httpd >/dev/null 2>&1
RETVAL=$?
action "启动 httpd:" /bin/true
return $RETVAL
}

stop() {
killproc httpd >/dev/null 2>&1
[ $? -eq 0 ] && action "停止 httpd:" /bin/true
}

case "$1" in
start)
start
;;
stop)
stop
;;
restart)
$0 stop
$0 start
;;
*)
echo "usage: $0 {start|stop|restart}"
esac
exit $RETVAL

f.系统自带的才是最好的.
请less /etc/init.d/httpd
要求：请所有同学用中文注释httpd脚本每一行,不会的可以咨询老师.
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