Shell

Output the top 10 system user names and UID numbers of the current system to the screenhead/etc/passwdString interception1${variable name: Start position: Length}echo ${variable name: Start position: Length}Variable name =${variable name: Start

Sed is a stream editor, which is a very useful tool in text processing and can be used perfectly in conjunction with regular expressions. When processing, the currently processed rows are stored in a temporary buffer called pattern space, followed

Installation of Linux systems:1.linux System Installation Method three kinds:1. Install the Linux system independently.2. Install the Linux system on the virtual machine.A. Install the virtual machine, basically go all the way down.B. Install

Restricting the shell, like Rsh and Scponly, allows the system administrator to restrict what Linux users can do, and you can create users that will be allowed to copy files through the SCP, but will not be allowed to log on to the system's command

Sort by the second character of the 1th field, if the field is only 1 characters followed by a number, the order of the letters after the normal sort of 2 charactersRepeated lines in a uniq are repeated without repeating rows, such as:1122And the

The code below, implements some common monitoring variables of the Linux system, shares to everybody @. [Email protected]#=============================# #Filename=system_monitor.SH#Author: foxsir#date: .- Geneva- the#=============================##!/

Meet Meaning && Command1 && command2: Command 1 returns True (command return value $? = = 0) after which command 2 talent is run. Can be used for if inference.CP 1.txt.. /&& echo "succes" #-->successCP 1.txt.. /&& rm-f.

Requirements are as follows:OriginalServername= "92 Service"Port= "10092"OS= "Android"Hidden= "false"recommendrate= "0"Newport=""ZoneID=""tabname= "Regional Service"/> Servername= "93 Service"Port= "10093"OS= "Android"Hidden=

The first part: expect explanationExpect allows us to automatically log on to remote machines, and can implement automatic remote execution of commands. Of course, if you use key authentication without a password, you can also implement automatic

First, the demandHere, I simplify, because this afternoon operation both texts are 10 tens of thousands of lines, but only filter out these two files contain the same or different string ppid.Two, step together1. Document HA1Abc2. Document HA2Acd3.

The definition of the shell function is almost the same as the normal C language function.function () {｝The return value of the Shell function can be displayed, and if there is no return then the execution result of the last statement will be

One, read user input (1) The basic Read command accepts input from a standard input or file descriptor and assigns the received data to a variable.1 Cat read. SH 2 #!/bin/bash3# Test the Read command4echo" "5read name6echo"Hello $name "The-p

Shell script: Batch modify file name (add character in file name)The previous article on the bulk modification of the file name (the file name of the addition of characters), the work also exists such a requirement, batch modify the file name,

Stacking of commands;However, many commands do not have idempotent, and it is necessary to use program logic to determine whether the running conditions are satisfied, so as to avoid errors in their operation.To run the script:(1) Give execution

--stdin indicates that a standard input can be made with any fileExpect its main function is to add a shell to the SSH process to pass the interactive instructions.Its core is the spawn expect send setSpawn calling the command to executeExpect waits

I wrote a script quit.sh, as follows:1 #/bin/bash2 If [$#-lt 1];then3 echo "must input at least one parameter!"4 Exit 15 fi67 if [= = "Q"];then8 echo "quit!"9 echo "$ (WhoAmI) quit @ $ (date)" >>/tmp/quit.txt #这里访问了quit. txtExit 0One elseecho "Wrong

Scripting features: Batch or single SSH-free login authenticationScript scenario: When deploying a cluster, most implementations want to configure the management node with SSH-free login from the node, writing the following script to simplify the

* Represents 0 or more arbitrary characters? Represents only one arbitrary character# comment Symbols\ de-signifier symbol[[email protected] ~]# ls #1. txt #将后面内容注释 only run LS111 1.tar 3.txt Install.log yasuo.zip111.tar 1.txt anaconda-ks.cfg

Background:A lot of people have been converted from C + +, after reading the study document, stepping into a lot of pits1 assigning values to variables don't have spaces# correct a = 123 # error2 if statement [] to leave a space, the variable is

Refer to the content of many posts in the cloud Zone, organized the nextWeblogic1. Write the shell to the console images directory and write