linux命令service与chkconfig用法教程

[root@node34 root]# service mysqld restart
停止 MySQL：       [  确定  ]
启动 MySQL：       [  确定  ]

[root@web ~]# cat /sbin/service
#!/bin/sh 
. /etc/init.d/functions 
 
VERSION="`basename $0` ver. 0.91" 
USAGE="Usage: `basename $0` < option > | --status-all |  
[ service_name [ command | --full-restart ] ]" 
SERVICE= 
SERVICEDIR="/etc/init.d"  
OPTIONS= 
 
if [ $# -eq 0 ]; then 
   echo "${USAGE}" >&2 
   exit 1 
fi 
 
cd / 
while [ $# -gt 0 ]; do 
  case "${1}" in 
    --help | -h | --h* ) 
       echo "${USAGE}" >&2 
       exit 0 
       ;; 
    --version | -V ) 
       echo "${VERSION}" >&2 
       exit 0 
       ;; 
    *) 
       if [ -z "${SERVICE}" -a $# -eq 1 -a "${1}" = "--status-all" ]; then 
          cd ${SERVICEDIR} 
          for SERVICE in * ; do 
            case "${SERVICE}" in 
              functions | halt | killall | single| linuxconf| kudzu) 
                  ;; 
              *) 
                if ! is_ignored_file "${SERVICE}"  
                    && [ -x "${SERVICEDIR}/${SERVICE}" ]; then 
                  env -i LANG="$LANG" PATH="$PATH" TERM="$TERM" "${SERVICEDIR}/${SERVICE}" status 
                fi 
                ;; 
            esac 
          done 
          exit 0 
       elif [ $# -eq 2 -a "${2}" = "--full-restart" ]; then 
          SERVICE="${1}" 
          if [ -x "${SERVICEDIR}/${SERVICE}" ]; then 
            env -i LANG="$LANG" PATH="$PATH" TERM="$TERM" "${SERVICEDIR}/${SERVICE}" stop 
            env -i LANG="$LANG" PATH="$PATH" TERM="$TERM" "${SERVICEDIR}/${SERVICE}" start 
            exit $? 
          fi 
       elif [ -z "${SERVICE}" ]; then 
         SERVICE="${1}" 
       else 
         OPTIONS="${OPTIONS} ${1}" 
       fi 
       shift 
       ;; 
   esac 
done 
 
if [ -x "${SERVICEDIR}/${SERVICE}" ]; then 
   env -i LANG="$LANG" PATH="$PATH" TERM="$TERM" "${SERVICEDIR}/${SERVICE}" ${OPTIONS}  
else 
   echo $"${SERVICE}: unrecognized service" >&2 
   exit 1 
fi 

[root@web init.d]# cat /etc/init.d/crond
#! /bin/bash 
# 
# crond          Start/Stop the cron clock daemon. 
# 
# chkconfig: 2345 90 60  
# description: cron is a standard UNIX program that runs user-specified  
#              programs at periodic scheduled times. vixie cron adds a  
#              number of features to the basic UNIX cron, including better  
#              security and more powerful configuration options. 
# processname: crond 
# config: /etc/crontab 
# pidfile: /var/run/crond.pid 
 
# Source function library. 
. /etc/init.d/functions 
. /etc/sysconfig/crond 
t=${CRON_VALIDATE_MAILRCPTS:-UNSET} 
[ "$t" != "UNSET" ] && export CRON_VALIDATE_MAILRCPTS="$t" 
  
# See how we were called. 
   
prog="crond" 
 
start() { 
        echo -n $"Starting $prog: " 
        if [ -e /var/lock/subsys/crond ]; then 
            if [ -e /var/run/crond.pid ] && [ -e /proc/`cat /var/run/crond.pid` ]; then 
                echo -n $"cannot start crond: crond is already running."; 
                failure $"cannot start crond: crond already running."; 
                echo 
                return 1 
            fi 
        fi 
        daemon crond $CRONDARGS 
        RETVAL=$? 
        echo 
        [ $RETVAL -eq 0 ] && touch /var/lock/subsys/crond; 
        return $RETVAL 
} 
 
stop() { 
        echo -n $"Stopping $prog: " 
        if [ ! -e /var/lock/subsys/crond ]; then 
            echo -n $"cannot stop crond: crond is not running." 
            failure $"cannot stop crond: crond is not running." 
            echo 
            return 1; 
        fi 
        killproc crond 
        RETVAL=$? 
        echo 
        [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/crond; 
        return $RETVAL 
} 
 
rhstatus() { 
        status crond 
} 
 
restart() { 
        stop 
        start 
} 
 
reload() { 
        echo -n $"Reloading cron daemon configuration: " 
        killproc crond -HUP 
        RETVAL=$? 
        echo 
        return $RETVAL 
} 
 
case "$1" in 
  start) 
        start 
        ;; 
  stop) 
        stop 
        ;; 
  restart) 
        restart 
        ;; 
  reload) 
        reload 
        ;; 
  status) 
        rhstatus 
        ;; 
  condrestart) 
        [ -f /var/lock/subsys/crond ] && restart || : 
        ;; 
  *) 
        echo $"Usage: $0 {start|stop|status|reload|restart|condrestart}" 
        exit 1 
esac