common_script

来自「Linux嵌入式设计配套光盘,学习嵌入式设计可参考」· 代码 · 共 89 行

#!/bin/bash

# This is a generic start/stop/restart/status script. Use environment
# variables to configure it for a particular daemon. This script relies on
# .pid files to determine whether the daemon is already running.

# The following are used by many of the startup scripts in this distro, but we
# don't currently use them in this simple script.

# . /etc/sysconfig/rc
# . $rc_functions
# . /etc/sysconfig/network


# Configuration for this script is provided by the following environment
# variables. See ./ladd or ./snmpd for examples.

# START_CMD
# PID_FILE
# STARTING_MSG
# STOPPING_MSG
# NOT_RUNNING_MSG
# RUNNING_MSG
# USAGE_MSG


case "$1" in
  start)
    if [ -f $PID_FILE ]; then
        PID=$(cat $PID_FILE)
        if [ -d /proc/$PID ]; then
            echo -n $RUNNING_MSG
            echo -n -e "\040"		# Force space before PID.
            echo $PID
        else
            echo $STARTING_MSG
            $START_CMD
        fi
    else
        echo $STARTING_MSG
        $START_CMD
    fi
  ;;

  stop)
    if [ -f $PID_FILE ]; then
        PID=$(cat $PID_FILE)
        if [ -d /proc/$PID ]; then
            echo $STOPPING_MSG
            kill $PID

            # Use "-f" since the process may have already removed the PID file
            # on termination.
            rm -f $PID_FILE
        else
            echo $NOT_RUNNING_MSG
        fi
    else
        echo $NOT_RUNNING_MSG
    fi
  ;;

  restart)
    $0 stop
    sleep 1
    $0 start
  ;;

  status)
    if [ -f $PID_FILE ]; then
        PID=$(cat $PID_FILE)
        if [ -d /proc/$PID ]; then
            echo -n $RUNNING_MSG
            echo -n -e "\040"		# Force space before PID.
            echo $PID
        else
            echo $NOT_RUNNING_MSG
        fi
    else
        echo $NOT_RUNNING_MSG
    fi
  ;;

  *)
    echo "Usage: $0 {start|stop|restart|status}"
    exit 1
    ;;
esac