Shell

[Root@centos65 liumengyang]# cat test.sh #!/bin/sh #if The process Exists,kill it pid=$ (Ps-ef|grep java| awk ' {print $} ') pidname=$ (ps-ef|grep java|grep-v ' grep ' |awk ' {print} ') #judge If the process is Running.if Not,restart. If

http://www.51testing.com/?uid-45739-action-viewspace-itemid-185211 JoinSimilar to the Join method in db, there is also a left join right join INNER JOIN, etc.Specifies the way the join is specified by the parameter-A.-A1 represents a row that

Here are two ways to use the shell's regular expressions. use method One: #赋值给变量var read var #定义regex正则表达式 regex= "[0-9]" if [$var =~ $regex]];then #match #do Something fi For example, to match the input, the requirement must be a number

1, shell overview Each person after successfully logged on to Linux, the system will appear a different hint symbol. For example, $, ~, #等, and then you can start typing the command you want, and if the command is correct, the system will execute

Recently started to learn bash shell, I do not know where to start, do not know what a good tool package to learn it. First Look for: yao@wuyao:~$ Apt-cache Search BashApparix-console-based Bookmark Tool for fast file system navigationBackup-manager-

If there is a possibility of a "^m" symbol in the end of a shell script that uses Windows editing Because MS-DOS and windows are carriage return + line wrapping, so in Linux with Vim to see the code written in Windows VC, after the end of the "^m"

1. startup file: service-restart.sh #!/bin/sh # java ENV source/etc/profile export java_home=/usr/local/jdk1.7.0_75 export jre_home= $JAVA _home/jre if [$# != 3]; Then echo "USAGE: $ service_dir service_name_pre disconf_env" echo "e.g.:

Today continue the last Find command content, mainly find and-exec and xargs combination and use. (9) The Find command can be combined with other commands with the help of an option-exec. -exec is one of the most powerful features of find. For

This article writes that Java invokes the Linux shell command and returns the result as a stream. The following is directly on the code, the code is annotated. Very plain and easy to understand. Import Java.io.BufferedReader; Import java.io.

1. Read command The read command reads information through a keyboard or a line of text in a file and assigns a value to a variable. 1.1, read reading the keyboard data, the input of the content before the return of the data assigned to a variable:

We renamed yesterday's log 00:00:01 every day, placed it in a specific directory, and then USR1 the information number control Nginx to regenerate a new log file Create a new shell script under directory/usr/local/nginx/logs/runlog.shNote: The file

First, Introduction 1. Cal Calendar LS Viewing files and directories WHOAMI Viewing Current user information Users or who or W view the current online user Logout Sign Out Shutdown or Powoff shut down the system Init 6 or Reroot reboot system passwd

Recently looking at the script inside the OpenWrt, with too handsome, the following 2 parameters extended expression of large use, all recorded. ${parameter:+expression} If parameter has a value and is not empty, use the value of

#!/bin/sh #backup tomcat1 log lastdate= ' date-d "-7 Day" +%y-%m-%d "logfile=/tomcatlog/localhost_access_log.$ Lastdate.txt if [-F "$logfile"]; Then echo ' exist file ' mv $logfile/tomcatlog/localhost_access_log. $lastdate. Txt.bak Tar

Everyone must know how to get the sed into the shell variable However, there is a problem with passing in the path variable. #!/bin/bash export vob=/home/fesu/server sed-n '/^vob/{s/\ (vob=\). */\1 ' "$VOB" '/P} ' $VOB/scripts/build/ Makefile

#判断数组中是否有给定元素 #参数: 1 arrays; 2 element #返回: Yes/no # Example: # Determine if there are elements in array Xrsh_array i3 # xrsh_array= (i1,i2,i3) # xrsh_tmp= ' echo ${xrsh_array[*]} ' # Xrsh_arrhasitem ' $XR Sh_tmp "" i3 "# returns YES # Note: The

Checkpid: Check if PID already exists, if one exists, return 0 (by viewing the/proc directory)Daemon: Start ServiceKillproc: Kill a processPidfileofproc: Finding the PID of a processPidofproc: Ditto, use the PIDOF commandStatus: Returns the state of

The previous writing test program used scripts to raise interest, combined with specific cases, to test the results of learning. Finally understand a slightly more complex shell script. There are still a lot of technical things in there. Declared

In the Linux shell, often input commands have a lot of similarities, even the same, if the long command, the efficiency is really very low, but can be through ctl+r, find the history of the previous input commands, it is very useful.After pressing

PM2:Start ----- pm2 Start/bin/www-watch stop ----- pm2 Stop app_name| app_id Display LogView port occupancy and force the release of occupied portsSometimes when the software is turned off, the background process dies, causing the port to be