How to use shell script debugging time

The company's recent server testing, the need to constantly adjust the system time, one or two is ok half, a little more points, on a variety of entanglements, the author of these several sets of the author is going crazy. Eldest brother: All speed up 3 minutes ... And then they all slow down for 5 minutes. Then we work, all kinds of date 01021511 ... you know. So in order to liberate the productive forces--the code is as follows:

#!/bin/bash # 
Author:mos # 
Script name:etime.sh 
# Date & time:2013-01-02/21:47:58 
# version:1.0.1 
# Description: 
# 
#ntpserver 
tip= ' time.nist.gov '
     
# Sync now system time, yes: $3= '-U '  No: $ is none. 
if [["$" = "-U"]];then 
    tcmd= '/usr/bin/rdate '
    [!-X $Tcmd] && echo ' rdate not install!! ' && Exit 1 
    "$Tcmd"-S "$Tip"
fi 
     
# MODF 
if [[-N "$" &&  "$ = =]-' | | "$" = = ' + ']];then 
    func=$1 
    [[$] = ' s ']] && num=$2 | | num=$ (($2*60)) 
    ntime= ' Date +%s ' 
    ltime=$ (($Ntime $func$num)) 
    #Date = '/bin/date-d @ ' $Ltime ' 2>/dev/ Null ' 
    #echo $Ltime 
    res= ' date-d ' 1970-01-01 UTC $Ltime seconds ' +%m%d%h%m%y.%s ' 
    date 
    date $Res 
else
    Echo ' first,input + or-; Second,input a number. '
    Exit 2 
Fi

The author has uploaded to the attachment, after downloading, first give a execute permission, then put to the system path:

[ROOT@VPN1 scripts]# ls 
casetup.sh  etime.sh 
[root@vpn1 scripts]# chmod +x etime.sh 
[ROOT@VPN1 scripts ]# MV Etime.sh/bin/etime

The usage format is as follows:

command [+|-] number [option]

I write the urgent, the code is not refined, careful use: For example, time synchronization failed to deal with, number location of the strict restrictions, etc., the use of the following example:

1. Sync with Time server (time.nist.gov)-U, code line nineth, you can modify the specified time server according to your location; If your rdate command is not installed to (/usr/bin/rdate), the script will automatically exit

[ROOT@VPN1 scripts]# Date 
Thu  3 00:13:25 CST 2013 
[root@vpn1 scripts]# etime + 0-u Wed]  2 16: 13:29 CST 2013  #第一行输出为当前时间, when the-u parameter is used, the time update order is ranked before the modification time
Wed  2 16:13:29 CST 2013  #第二行输出为修改为时间
[ROOT@VPN1 scripts]# grep-n "time.nist.gov"/bin/etime 
9:tip= ' time.nist.gov '

See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/OS/Linux/

2. Take the current system time, adjust the speed 10 minutes, by default in minutes

[ROOT@VPN1 scripts]# etime + 10

Wed 2 16:24:47 CST 2013

Wed 2 16:34:47 CST 2013

3. Take the current system time, slow down 20 minutes, in seconds

[ROOT@VPN1 scripts]# Etime-600-s

Wed 2 16:36:27 CST 2013

Wed 2 16:26:27 CST 2013

4. Take the current world time, adjust the speed 50 minutes, only in minutes

[ROOT@VPN1 scripts]# etime + 50-u

Wed 2 16:28:25 CST 2013

Wed 2 17:18:25 CST 2013

Two additional time servers that are temporarily available:

Time.nist.gov

Rdate.darkorb.net

Time-b.nist.gov

Ntp.openxid.com

It's not easy to write, feel good, give a praise (^-^).

This article from the "Self-Improvement" blog, please be sure to retain this source http://mos1989.blog.51cto.com/4226977/1106272