Shell

Here are some of the shell's commonly used shortcut keys, shortcut keys to play familiar with to a certain extent, can improve productivity drops ... + a switch to command line start + e switch to command line end + L Clear Screen

/*-------------------------------------------------------------------------------------------@ Black eyed poet --------------------------------------------------------------------------------------------*/A variable is a unit of computer memory

TopicWrite a script1. Pass a parameter to the script, this parameter is the user name;2. If the user exists, perform the following tasks* If the user's ID number is less than 500, display it as an administrator or system user;* Otherwise, display it

#!/bin/bash# gets all m3u8 files in the current directory, and Var=$(ls|grep '. m3u8'|Cut-D'.'-F1) #死循环 while[1=1 ] Do#循环每个文件 forStreaminch$var Do#获取当前最新视频文件 TS=$(ls-t|grep "$stream") for file inch$ts Do#存储M3U8文件文件名作为图片文件名, for* -, capturing

1. Write the shell script, calculate 1-100 's and;650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/71/B2/wKiom1XWy-eBa3uqAAENi2u4ldc587.jpg "title=" 1.jpg " alt= "Wkiom1xwy-eba3uqaaeni2u4ldc587.jpg"/>2. Write the shell script, ask for a

Reprinted from: Linux Shell arithmetic operationsThere are four ways in which the Bash Shell's arithmetic operations are:1: Using expr external programAddition R= ' Expr 4 + 5 'Echo $rAttention! ' 4 ' + ' 5 ' There should be a gap between the threeR=

Recently learned SCP automatically entered the password.#!/bin/bashSet-xTime= ' Date +%y%m%d%h%m%s 'Source= '/home/cqq/project 'Passwd= ' 123 'Tar zcvf ${time}.tar.gz $SOURCE >>/dev/null 2>&1Expect-c "Spawn scp-r [Email

Getopts is a built-in command of the shell, typically used to handle shell command-line options, but cannot handle long options (such as--prefix=/home, etc.) directly.Getopts has 2 parameters, the first parameter is a string, including the character

1. Two modes of this article command:Interactive mode, the shell environment for hive:hive > ....Non-interactive mode: normal Linux command mode :% ... ..2.Hive Shell Common operations1) Hive-e: Executes the specified HQL from the command line and

#！ /bin/bashAction () {#1, get SVN update output/OPT/SVN/SVN/BIN/SVN update/opt/lampz/apache/web > File_out#2, gets the number of rows through the output file File_outline=$ (wc-l File_out|awk ' {print $} ')#3, if the number of rows is greater than 2

Scripting: Stacking of commandsThe first line of any script:#!/bin/bash: The Interpreter pathIn addition to the previous # number as a commentExecute permission before script execution: chmod +x file nameCondition Judgment in bash:Condition Test

Tenth line:https://leetcode.com/problems/tenth-line/Test Instructions: prints the 10th line of a file.The problem involves several points:1. How do I read a file?2. How do I find line 10th?3. What if the file is empty or less than 10 lines?Solution:1

$ represents the ID of the current shell process, which is the PID $echo $$Run results2934List of special variables variables meaning $0 filename of the current script arguments passed to

In general, you may need to switch the root user to another user for execution during the automation process, such as: OralceHowever, the execution of the command will return to the root user, continue to execute other commands under the root

Automatic installation:Of course, if you trust this open source project author, you can try to use the automatic installation method. wget Https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh-O-| Sh Manual Installation:1.

First, Introduction1. Variable type:User-defined variables (local variables)Environment variables: Define each user's operating environment, has learned path,ps1; to be permanent, write to the corresponding locationPre-defined variablesPositional

grep Basic Usagegrep [Options] [mode] [file:]Options-C outputs only the number of matching rows-I ignore case when searching-H does not display file names when querying multiple files-L searches only for matching file names, not specific matching

Idea: After Nginx starts, there will be a nginx.pid file in the specified location, by judging whether the file exists. Determine if Nginx has been started.#!/bin/bash#this is my first try to test write a shell to control nginx Daemon#History 2015-08

Transferred from: http://my.oschina.net/aiguozhe/blog/41557, and the content was verified and modified.1. Take the lengthstr="abcd"expr length $str 4echo ${#str} 42. Find the location of the substringIt seems that only a single character is

Modified by the Geotrace script, the original script has a lot of problems, looked up some awk data to solve the original problem.mtr-0.86 version installation failed, need to update some software, so the use of 0.80can also use Nali this software,