linux shell scripting cookbook

to hit the command one at a time. Shell scripts are similar to programming languages, and there are variables and process control statements, but shell scripts are interpreted and do not need to be compiled, and the shell program reads and executes the commands from a single line of script, which is equivalent to a user knocking a line of commands from the

through alias set shortcut commandCommand () {list1= (' cat ~/.BASHRC | grep custom ') for ((i=0;i10. Referencing other shell scripting methods# # # ====================================================#### Auth:wonter # # # # # date:2014-06-12 # # Path: javame.cnblogs.com # # # # # # ====================

Overview:Statement control for Shell scripts-There are three processes in the process programming language mentioned earlier:Sequential execution: Executed in the order of a single statement;Select execution: Select execution according to the conditions;Loop execution: Loop execution According to the given loop condition.-Where the order does not require specific control, just follow the statement in sequence, select execution, you need a specific con

Tags: shell script1. Write Script/root/bin/sumid.sh, calculate the sum of the ID of the 10th user and the 20th user in the/etc/passwd fileSolution: vim/root/bin/sumid.sh#!/bin/bashTenuser= ' cat/etc/passwd | Head-n10 | Tail-n1 |cut-d:-f3 'Twentyuser= ' cat/etc/passwd | Head-n20 |tail-n1 | cut-d:-f3 'Let Sum=$[tenuser+twentyuser]echo "The Tenuser and Twentyuser finally is $sum"2, write the script/root/bin/sumspace.sh, pass two file path as parameters t

This article describes the most commonly used tools for using shell to process text under Linux:Find, grep, Xargs, Sort, uniq, tr, cut, paste, WC, sed, awk;The examples and parameters provided are the most common and practical;The principle I use for Shell scripting is to write the command line, and try not to exceed 2 lines;If you have more complex task requirem

${var%%pattern},{var# #patten} is removed as long as the shortest possible. If you do not use wildcards, there is no shortest and longest concept.The common use is to get the file name and the path of the files from a full path.Path= $HOME/public/foo.sh${path##*/} will return the filename foo.sh, removing the longest match found on the left by */${path%/*} will return the directory where the file is located $home/public (the actual returned value $home will be replaced with the real path), remo

Tags: shell script1 What shell?Shell is a scripting languageYou can use logical judgments, loops, and other syntaxFunctions can be custom-definedThe shell is a collection of system commandsShell scripts enable automated operations, which can greatly increase our operational

One way is to useCatand anti-quotePS: Anti-quotes play the role of command substitution in Linux. Command substitution refers to the ability of the shell to interpolate the standard output of a command anywhere on a command line.The input format is as follows:20151207[email protected]. com20151225155581558905678As followsThe internal field delimiter (Internal field Separator, IFS) is an important concept in

Share a concurrent script that simulates multithreading under Linux, using this script to execute related commands on a defined number of servers at the same time, which is much more efficient than a normal for/while loop and can be executed in a single execution, and is very useful when managing a large number of servers.The following scripting features update packages through SCP (or rsync) up to thousand

The main purpose of the script is to practice capturing signals in a Linux bash script, by practicing the use of functions, and by terminating a running program, subsequent processing of files opened by the program, and so on!Scripting Features:Ping IP within a network segment, detect which IP is online, which IP is not onlinecommand to Practice:1, MktempUsage: #mktemp 1117.www.qixoo.qixoo.com/path/to/somef

The main purpose of the script is to practice capturing signals in a Linux bash script, by practicing the use of functions, and by terminating a running program, subsequent processing of files opened by the program, and so on!Scripting Features:Ping IP within a network segment, detect which IP is online, which IP is not onlinecommand to Practice:1, MktempUsage: #mktemp/path/to/somefile.xxx where XXX can be

First of all, I personally understand the shell, I think the shell is a kind of command through a variety of control to implement the collection of Linux commands a batch processing of a scripting language.Shell programming is very simple, but the syntax is not much, but advanced s