If statement of Bash condition Judgment (ii)

Exercise : Write a script: You can accept a parameter that uses the following form:
script.sh {Start|stop|restart|status}
If the argument is start, the empty file/var/lock/subsys/script is created and the starting script successfully is displayed. ；
If the parameter is stop, the file/var/lock/subsys/script is deleted and the Stop script finished is displayed. ；
If the parameter is restart, the file/var/lock/subsys/script is deleted and the restarting script successfully is displayed. ；
If the parameter is status, then:
If the/var/lock/subsys/script file exists, it is displayed as "script is running."
Otherwise, it is displayed as "script is stopped."
Any other parameter: "script.sh {start|stop|restart|status}" is displayed

#!/bin/bash# date: 2015-04-06# author: arvinlau# description: # version:  1.0filename= ' basename $0 ' filepath= "/var/lock/subsys/$FileName"      #变量替换, using double quotes if  [ $# -lt 1 ]; then    echo  "usage:$0 {start  | restart | stop | status} "    exit 5fiif [ $1  == start ]; then    touch  $FilePath     echo   "starting  $FileName  successfully." elif [ $1 == stop ]; then    rm -f  $FilePath      echo  "stop script finished." elif [ $1 == restart ]; then    rm -f  $FilePath     touch  $FilePath     echo  "restarting script  Successfully. " elif  [ $1 == status ]; then    if [ -e  $FilePath  ] ; then        echo  "script is running."     elif [ ! -e  $FilePath  ]; then         echo  "script is stopped."     fielse    echo  "Usage:$0 {start | restart  | stop | status} "    exit 7fi

#虽然目前知识所写的脚本, the function is simple, but can be as far as possible to improve the actual situation, the following script, the existence of the file to judge, supplementary script is insufficient.

#!/bin/bash# date: 2015-04-06# author: arvinlau# description: # version:  1.0filename= ' basename $0 ' filepath= "/var/lock/subsys/$FileName"      #变量替换, using double quotes if  [ $# -lt 1 ]; then    echo  "usage:$0 {start  | restart | stop | status} "    exit 5fiif [ $1  == start ]; then    if [ -e  $FilePath  ];  then     #判断文件是否存在         echo  "$FilePath  is running. "     else        touch  $FilePath          echo  "starting  $FileName  successfully."     fielif [ $1 == stop ]; then    if  [ -e  $FilePath ]; then     #判断文件是否存在         rm  -f  $FilePath         echo  "stop script finished."     else        echo  "$FilePath  is  Stopped. "     fielif [ $1 == restart ]; then    if  [ ! -e  $FilePath  ]; then     #如果文件不存在          echo  "$FilePath  is stopped."     else        rm -f  $FilePath          touch  $FilePath          echo  "restarting script successfully."     fielif [ $1 == status ]; then    if [ -e  $FilePath  ]; then        echo  "Script is running."     elif [ ! -e  $FilePath  ]; then         echo  "script is stopped."     fielse    echo  "Usage:$0 {start | restart  | stop | status} "    exit 7fi

The above script is the SYSV style service script

The Redhat series can execute these service scripts in the following ways

# Service Network Start

#/etc/rc.d/init.d/network Start

#/etc/init.d/network Start

This article is from the "Arvin Lau" blog, be sure to keep this source http://64314491.blog.51cto.com/2784219/1629219

If statement of Bash condition Judgment (ii)