#!/bin/bash -
#===============================================================================
#
#          FILE: bgcmd
#
#         USAGE: 方式1 -- $ ./bgcmd             # 启动指定后台程序
#                方式2 -- $ ./bgcmd off         # 结束指定后台程序
#
#   DESCRIPTION: 后台运行程序/命令（类似于deamon进程）
#
#       OPTIONS: ---
#  REQUIREMENTS: >> 按需要修改 cmd 和 need_root 这两个变量<<
#          BUGS: ---
#         NOTES: ---
#        AUTHOR: linkscue(scue),
#  ORGANIZATION:
#       CREATED: 2013年08月14日 22时04分38秒 HKT
#      REVISION:  ---
#===============================================================================get_process(){cmd="$1"ps aux | grep -v 'grep' | grep "$cmd" | awk '{print $2}'
}kill_process(){exist="$1"if [[ "$need_root" != "" ]]; thensudo kill $existelsekill $existfiecho "process [ $(echo $exist) ] had killed."
}#-------------------------------------------------------------------------------
#  cmd: 希望在后台执行的程序/命令
#  need_root: 是否需要root权限执行
#-------------------------------------------------------------------------------
need_root=true
cmd="python -m SimpleHTTPSever 80"# get root, if need.
if [[ "$need_root" != "" ]]; thensudo ls > /dev/nullret=$?if [[ $ret != 0 ]]; thenecho "can't get root, exit."exit 1fi
fi# run cmd
exist=$(get_process "$cmd")
if [[ "$1" != "" ]] ; then                      # kill processkill_process "$exist"
elseif [[ "$exist" != "" ]]; thenkill_process "$exist"fiif [[ "$need_root" != "" ]]; thensudo nohup $cmd >/dev/null 2>&1 &       # run as rootelsenohup $cmd > /dev/null 2>&1 &           # run as otherfisleep 0.1exist=$(get_process "$cmd")echo "run [ $(echo $exist) ] at background."
fi