Shell

Before constantly testing the Pgsql on VM VMS, it is still a bit cumbersome to install.So we collected a

In Linux systems, it is sometimes necessary to modify the IP address of the network card. In many cases, our maintenance of the Linux system is managed remotely (SSH), so that when the IP address changes, the connection between us and the server

650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M02/80/20/wKiom1c4dD-wFZx7AAAbgLBZiMU936.jpg "title=" Wkiol1cwdpjb1fbhaaabfqyv8vs885.jpg "alt=" Wkiom1c4dd-wfzx7aaabglbzimu936.jpg "/> First, the great cycle of the For loop

For n in ' seq-w ' do pass= ' echo $RANDOM |md5sum| Cut-c 2-9 ' Useradd test$n echo $pass | passwd--stdin test$n echo-e "test$n \ t $pass" >>/tmp/user.logdoneNote:The-W usage of seqGeneration of random numbersCUT-C: intercepts the specified range of

Shell annotations1. Single-line CommentLines that begin with "#" are comments, which are ignored by the interpreter.debian:/# Vim first.sh#!/bin/sh#This is my first shell (this line is a comment)echo "Hello World"2. Multi-line annotationsThere are

Types of variables for bash本地变量（局部变量）环境变量位置变量:$1,$2,$3, ...特殊变量:$?,$#,$*,[email protected]The location variable that gives the script the ability to get external parameters,$1 for the first argument,$2 for the second argument, and so onCases:vartest.

1.Shell Script IntroductionBasic Introduction:A shell script is an executable plain text file that consists of multiple shell commands.Command execution is from top to bottom, from left to right analysis and executioncommand, multiple whitespace

Words do not say much, straight to the subject, LZ is not bad at writing an article, just record their own learning process in a bit drops.Note: The shell is sensitive to case letters. Open terminal appears: [email protected]$ Span style=

1. Check the host network card traffic#!/bin/bash#networkWhile:; DoTime= ' Date +%m '-"%d" "%k": "%m"day= ' Date +%m '-'%d 'Rx_before= ' ifconfig eth0|sed-n ' 8″p|awk ' {print $} ' |cut-c7-'Tx_before= ' ifconfig eth0|sed-n ' 8″p|awk ' {print $6} '

Simple needs to explain shell+expectInstall the Expect,yum installation firstYum Install Expect-y#!/bin/baship= ' 192.168.80.20 ' #定义远程交换服务器的IPpassword= ' [email protected] ' #定义输入的密码Expect Spawn ssh [email protected] $ip ls #在expect中执行命令Set Timeout-

Record a few simple examples of loop-related1. Wait for the expected content to be entered#!/bin/Bashuntil["$yn"=="Yes"-O"$yn"=="YES" ] DoRead-P"Please input yes/yes to stop this progras:"yn DoneEcho "ok! You input the correct answer."Wait to enter

1. Command-line arguments1.1 Parameters space-delimited, format: $+position, e.g. $, $, $, where $ $ represents the script name, more than 10 parameters, e.g. the 10th parameter is represented by ${10};1.2 Simple example:1.3 Through the

Http://www.linuxidc.com/Linux/2012-04/59093.htmPeople often write and use makefile, makefile often use the shell, but some of them need to pay attention to the place is not necessarilyWill pay attention, here are listed a few come, do not know

Shell arithmetic operation addition Note! ' 4 ' + ' 5 ' between these three should have blank r= ' expr 4 + 5 ' echo $rr =$[4 + 5]echo $rr =$ ((4 + 5)) echo $r multiplication r= ' expr 4 \* 5 ' r=$ ((4 * 5)) r=$[4 * 5]echo $r Division r= ' Expr 40/5

Batch modify file suffixThe first type:#!/bin/bashfor fn in *.$1domv $fn ${fn%$1}$2doneThe second type:Find. -name "*.txt" | Awk-f ' [./]+ ' {print $} ' | Xargs-i-T mv {}.txt {}.shGREP User TipsThe file is as follows:# cat Test.txt This was a test

The code is as follows:#ac = ' ifconfig -a | grep encap | awk  ' {print $1} ' ac= ' ifconfig |  grep encap | awk  ' {print $1} ' for i in  $acdo          if [  $i  ==  "Lo"  ];then         echo  $i         ifconfig  $i  |  grep  "inet addr"  | sed  '

"Problem" script implementation, you can use Shell, Perl and so on. Save all the rows in file B, but none in file a, to file C and count the number of lines in C.To translate adult words is, suppose that there is a file a is:ABCDFile B is:1234ABNow

1. Piping "|"ls | Cat-n > OUT.txt2. Child shell2.1 Child Shell DescriptionYou can use the () operator to define a child shell in a shell script#/bin// ; ls) pwdExecution results　　Description: Does not have any effect on the current shell when the

1. Count the IP addresses of the top 10 IP trafficCat Access.log | awk ' {print '} ' | Sort | uniq-c | Sort-nr | Head-n 102. View the current day IP traffic statisticsCat Access.log |grep "21/apr/2016" |awk ' {print $} ' |sort|uniq-c|sort-nr3. View

1. To Peanut Shell website:Peanut Shell official website: hsk.oray.com Download Peanut Shell Intranet version installation package oraynewphrapi.tgz2. Unzip under any path on the Raspberry PiDecompression: Tar zxvf oranynewphrapi.tgzInstall: Execute