整理 Ubuntu 的各种小场景

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usage: update-rc.d [-n] [-f] <basename> remove
       update-rc.d [-n] <basename> disable|enable [ S|2|3|4|5]
        -n: not really
        -f: force

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# !/bin/bash
### BEGIN INIT INFO
#
# Provides:  <可执行脚本名>
# Required-Start:   $local_fs  $remote_fs
# Required-Stop:    $local_fs  $remote_fs
# Default-Start:    2 3 4 5
# Default-Stop:     0 1 6
# Short-Description: initscript
# Description: This file should be used to construct scripts to be placed in /etc/init.d.
#
### END INIT INFO

## Fill in name of program here.
PROG="<可执行脚本名>"
PROG_PATH="<可执行脚本路径>" ## Not need, but sometimes helpful ( if $PROG resides in /opt for example ) .
PROG_ARGS=""
PID_PATH="/var/run/"

start ( ) {
    if [ -e "$PID_PATH/$PROG.pid" ]; then
        ## Program is running, exit with error.
        echo "Error! $PROG is currently running!" 1>&2
        exit 1
    else
        ## Change from /dev/null to something like /var/log/$PROG if you want to save output.
        $PROG_PATH/$PROG $PROG_ARGS 2>&1 >/var/log/$PROG &
    $pid=`ps ax | grep -i 'location_server' | sed 's/^\ ( [0-9]\{1,\}\ ) .*/\1/g' | head -n 1`

        echo "$PROG started"
        echo $pid > "$PID_PATH/$PROG.pid"
    fi
}

stop ( ) {
    echo "begin stop"
    if [ -e "$PID_PATH/$PROG.pid" ]; then
        ## Program is running, so stop it
    pid=`ps ax | grep -i 'location_server' | sed 's/^\ ( [0-9]\{1,\}\ ) .*/\1/g' | head -n 1`
    kill $pid

        rm -f  "$PID_PATH/$PROG.pid"
        echo "$PROG stopped"
    else
        ## Program is not running, exit with error.
        echo "Error! $PROG not started!" 1>&2
        exit 1
    fi
}

## Check to see if we are running as root first.
## Found at http://www.cyberciti.biz/tips/shell-root-user-check-script.html
if [ "$ ( id -u ) " != "0" ]; then
    echo "This script must be run as root" 1>&2
    exit 1
fi

case "$1" in
    start )
        start
        exit 0
    ;;
    stop )
        stop
        exit 0
    ;;
    reload|restart|force-reload )
        stop
        start
        exit 0
    ;;
    ** )
        echo "Usage: $0 {start|stop|reload}" 1>&2
        exit 1
    ;;
esac

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SHELL=/bin/bash                    ## 指定命令执行的环境
PATH=/sbin:/bin:/usr/sbin:/usr/bin ## 执行命令路径
MAILTO=root                        ## 执行信息包括 echo 会通过邮件发送 root 用户

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### 命令格式:
# min    hour     day   month weekday ( 0==7 )
# ( 0~59 ) ( 0~23 ) ( 1~31 ) ( 1~12 ) ( 0~7 ) [user ] command

3,15 8-11 */2 * * command              ## 每隔两天的上午 8 点到 11 点的第 3 和第 15 分钟执行
0 23-7/2,8 * * * command              ## 晚上 11 点到早上 8 点之间每两个小时和早上八点
0 1 * * * * run-parts /etc/cron.hourly ## 每小时执行目录内的脚本

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/var/log/nginx/*.log {
    daily
    rotate 7              ## 日志转储数
    size 5k               ## 日志文件最大大小，超过则转储
    compress              ## 通过 gzip 压缩转储日志
    delaycompress         ## 转储日志在下一次转储才压缩
    create 0640 root root ## 转储创建新文件属性
    copytruncate          ## 若日志在打开，则备份当前日志并截断
    missingok             ## 丢失日志不报错，继续轮转
    notifempty            ## 日志为空则不轮转
    noolddir              ## 转储后的与当前的日志于同一目录下
    dateext
    dateformat -%Y-%m-%d  ## 日志名插入日期值

    sharedscripts         ## 对一条脚本，所有日志都轮转后统一执行一次，否则每次轮转都执行一次
    prerotate             ## 转储前执行的脚本
        if [ -d /etc/logrotate.d/httpd-prerotate ]; then \
            run-parts /etc/logrotate.d/httpd-prerotate; \
        fi \
    endscript
    postrotate            ## 转储后执行的脚本
        invoke-rc.d nginx rotate >/dev/null 2>&1
    endscript
    postrotate
        test -r /var/run/nginx.pid && kill -USR1`cat /var/run/nginx.pid`
    endscript
}