概述
众所周知，shell脚本使用的是非交互式方式，在非交互式模式下alias扩展功能默认是关闭的，此时虽然可以定义alias别名，但是shell不会将alias别名扩展成对应的命令，而是将alias别名本身当作命令执行，如果shell内置命令和PATH中均没有与alias别名同名的命令，则shell会找不到指定的命令。
在shell中开启alias
使用shell内置命令shopt命令来开启alias扩展选项。shopt是shell的内置命令，可以控制shell功能选项的开启和关闭，从而控制shell的行为
常用命令：
| Command | Desc |
|---|---|
| shopt -s opt_name | Enable (set) opt_name. |
| shopt -u opt_name | Disable (unset) opt_name. |
| shopt opt_name | Show current status of opt_name. |
比如
查看同义词是否开启（交互模式下）
[/xgj/gj]$shopt expand_aliases
expand_aliases on
shopt expand_aliases在交互式模式下 默认是打开的，在非交互式模式下是关闭的,但可以用可shopt来将其开启
shopt -s expand_aliases
实际操作
在我们的项目中某个模块的双机启动脚本（root用户下操作），其中应用的启停使用了alias建立的同义词来操作，如果想要在脚本中使用，必须开启同义词才。
项目启动中会依赖一些环境变量，所以双机启动脚本中需要显式的引入.bash_profile文件。
所以我们将 开启alias的命令放在 .bash_profile中。
source .bash_profile 生效。
脚本如下:
#!/bin/bash
@H_301_95@##############################################
@H_301_95@## Name: drm_script.ps
@H_301_95@## Desc: Duplex switch script of DRM
@H_301_95@## Param: None
@H_301_95@## Author: Mr Yang
@H_301_95@## Date: 2017-07-25
@H_301_95@## Version:V1.0
@H_301_95@## Comment: /drm/.bash_profile must set "shopt -s expand_aliases" so that the alias in the script works well
@H_301_95@##############################################
@H_301_95@#atcive the environment variable
source /drm/.bash_profile
@H_301_95@#main menu of tomcat and jobserver
tomcat_jobserver_menu=/drm/drm
@H_301_95@#main menu of uip and bp1
uip_bp1_menu=/drm/zsmart-uip-8.1.0/bin
@H_301_95@#stauts of tomcat(webserver) pgrep -f "\-Dz_app=cvbs"
status_tomcat=$(pgrep -f Dz_app=cvbs | wc -l)
@H_301_95@#status of jobserver
status_jobserver=$(pgrep -f Dz_app=jobserver | wc -l)
@H_301_95@#status of uip
status_uip=$(pgrep -f Dz_app=uip | wc -l)
@H_301_95@#status of bp1
status_bp1=$(pgrep -f Dz_app=bp1 | wc -l)
@H_301_95@#pid of tomcat
pid_tomcat=$(pgrep -f Dz_app=cvbs)
@H_301_95@#pid of jobserver
pid_jobserver=$(pgrep -f Dz_app=jobserver)
@H_301_95@#pid of uip
pid_uip=$(pgrep -f Dz_app=uip)
@H_301_95@#pid of bp1
pid_bp1=$(pgrep -f Dz_app=bp1)
@H_301_95@#########################################
@H_301_95@#
@H_301_95@#start all processes including tomcat/jobserver/uip/bp1
@H_301_95@#start tomcat/jobserver with drmtool
@H_301_95@#start uip/bp1 with uip.sh
@H_301_95@#
@H_301_95@#########################################
startProcess(){
echo "stop first"
@H_301_95@#there are some problems if you execute startProcess twice or more times,so stop process first
stopProcess
@H_301_95@#start jobserver and tomcat
echo "begin to start [tomcat,jobserver]"
su - drm -c "cd $tomcat_jobserver_menu; jobstart ; start; exit" > /dev/null 2>&1
echo "sleep 5 seconds..."
sleep 5
echo "begin to start [uip,bp1]"
@H_301_95@#start uip and bp1
su - drm -c "cd $uip_bp1_menu; startuip; startbp1; exit" > /dev/null 2>&1
}
@H_301_95@#########################################
@H_301_95@#
@H_301_95@#stop all processes including tomcat/jobserver/uip/bp1
@H_301_95@#stop tomcat/jobserver with drmtool
@H_301_95@#stop uip/bp1 with uip.sh
@H_301_95@#
@H_301_95@#########################################
stopProcess(){
@H_301_95@#stop tomcat、jobserver
echo "begin to stop process[tomcat,jobserver]"
su - drm -c "cd $tomcat_jobserver_menu ; stop ; jobstop ; exit" > /dev/null 2>&1
echo "process[tomcat,jobserver] stopped sucessfully,sleep 3 seconds"
sleep 3
@H_301_95@#stop uip、bp1
echo "begin to stop process[uip,bp1]"
su - drm -c "cd $uip_bp1_menu && stopbp1 && stopuip && exit" > /dev/null 2>&1
echo process[uip,bp1] stopped sucessfully
}
@H_301_95@#########################################
@H_301_95@#
@H_301_95@#print the status of each process
@H_301_95@#
@H_301_95@#########################################
status(){
@H_301_95@#status of tomcat
check_status $status_tomcat tomcat
@H_301_95@#status of jobserver
check_status $status_jobserver jobserver
@H_301_95@#status of uip
check_status $status_uip uip
@H_301_95@#status of bp1
check_status $status_bp1 bp1
}
@H_301_95@#########################################
@H_301_95@#
@H_301_95@#public function
@H_301_95@#checking status of each process
@H_301_95@#
@H_301_95@#########################################
check_status(){
if [ $1 -eq 1 ] ; then
echo "$2 is working..."
elif [ $1 -gt 1 ] ;then
echo -e " \033[31m more than one $2 process has been start,make sure only one process exists \033[0m "
else
echo -e " \033[31m $2 stopped \033[0m "
fi
}
@H_301_95@#########################################
@H_301_95@#
@H_301_95@#stop all processes by force
@H_301_95@#find the pid,and kill the pid
@H_301_95@#
@H_301_95@#########################################
forcedstop(){
@H_301_95@#kill tomcat
kill_process $pid_tomcat cvbs
@H_301_95@#kill jobserver
kill_process $pid_jobserver jobserver
@H_301_95@#kill uip
kill_process $pid_uip uip
@H_301_95@#kill bp1
kill_process $pid_bp1 bp1
}
@H_301_95@#########################################
@H_301_95@#
@H_301_95@#public function
@H_301_95@#kill each process
@H_301_95@#
@H_301_95@#########################################
kill_process(){
@H_301_95@#check the length of $1 [zero:false,non-zero:true]
@H_301_95@#two parameters [$1->pid,$2->processName],if $1 is null,$2 will replace $1,$2 turns to $1,so make sure $1 is number
if [[ -n $1 && $1 -gt 0 ]] ; then
echo "pid: $1,process: $2"
kill -9 $1
if [ $? == 0 ] ; then
echo "pid: $1,process: $2 has been stopped successfully"
sleep 1
fi
else
echo -e " \033[31mpgrep -f Dz_app=$1 without result,$1 has been stopped \033[0m "
fi
}
@H_301_95@#########################################
@H_301_95@#
@H_301_95@# $1 variable
@H_301_95@# $1 can only with (start/stop/status/restart/forcedstop)
@H_301_95@#
@H_301_95@#########################################
case "$1" in
'start')
startProcess
;;
'stop')
stopProcess
;;
'status')
status
;;
'restart')
@H_301_95@#stopProcess
@H_301_95@#sleep 3
startProcess
;;
'forcedstop')
forcedstop
;;
*)
echo -e "\033[31m Usage: $0 { start | stop | restart | forcedstop | status} \033[0m"
exit 1
esac
exit 0
