Shell

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

Twenty. To get the system run data through the pipeline Combination shell command :1. Output the 5 most memory-intensive commands in the current system:#1) Lists all the processes that are running on the current host through the PS command.#2) The

Regular expressions Used primarily for pattern split/match/Find and replace operations on strings. Regular expressions and wildcard characters Wildcard charactersThe difference between a regular and a wildcard: A regular match string

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

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)% $[

###### #时钟#!/bin/bashMin=1Hour=1for ((sec=5; sec>=0; sec--))DoEcho-ne "${hour}:${min}:${sec}s End"Sleep 1Echo-ne "\ r \ r"While ["$SEC"-le "0"-a "$MIN"-ge "0"]DoEcho-ne "${hour}:${min}:${sec}s End"Echo-ne "\ r \ r"((min--))Sec=60While ["$MIN"-lt "0"-

#! /usr/bin/expectset ip 10.91.96.                  ######    Network Segment Set time 30set username  root#### #for  {set ip 11} {$ip > /etc/login.defs\r "send " echo PASS_MIN_DAYS  5 >> /etc/login.defs\r "send " echo pass_warn_age 7 >> /etc/ Login.

#! /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 

#! /bin/bashecho-n Input year to judge if it was a leap year:read yearlet "y1= $year% 4" let "y2= $year%" let "y3= $year% 4 XX "If [! "$y 1"-eq 0]thenleap=0elif [! "$y 2"-eq 0]thenleap=1elif ["$y 3"-eq 0]thenleap=1elseleap=0fiif ["$leap"-eq

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

Shell expressionWhether the-D file exists and is a directoryThe-f file is present and is a normal fileWhether the-W file file exists and is writable-s file exists and is not empty-N string string length not 0String1=string2 string Equality-eq equals-

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

Log-in Shell:Su–usernameSu-l usernameNon-logon Shell:SU usernameOpen Command Window under graphics terminalShell scripts that are executed automaticallyBash's configuration fileGlobal

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

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:[

First, demonstrate the effect of rebound shell0. Look at the Python version650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M02/8B/90/wKioL1hRTinAlo_nAAASu8q0u_A128.jpg "title=" Python.jpg "style=" Float:none; "alt="