linux scripting basics

$# The number of arguments passed to the script or function $*/[email protected] All parameters passed to the script or function. When enclosed by double quotation marks (""),[email protected] is slightly different from $* $$ The current shell process ID, which is the process ID for the shell script, which is where these scripts are located Take a look at the following script:#!/bin/bashecho "File Name: $0"echo "First Parame

much like a C-language functional pointer? Like the C language, Lua's functions can accept a variable number of parameters, which are also defined by "...", such as:function sum (A, B,...)If you want to get ... Represents the parameter that can be obtained by accessing the ARG local variable (table type) in the function.such as SUM (1,2,3,4)Then, in the function, a = 1, b = 2, arg = {3, 4}More valuable is that it can return multiple results at the same time, such as:function S ()Return 1,2,3,4E

listDoCommand sequenceDoneFor a in Zhangsan Lisi Wangwu DCDoUseradd $aDoneVariable a participates in the loop, and the variable a value affects the result of the loop[Email protected]/]# vim/root/for.sh#!/bin/bashFor a in Nsd11 nsd12 nsd13 nsd15DoUseradd $aEcho $a created successfullyDoneVariable A does not participate in the loop, and the variable a value does not affect the result of the loop#!/bin/bashFor a in 1 2 3Do echo hello worlddone[Email protected]/]# cat/root/num.sh#!/bin/bashnum

only numbers, letters, or underscores, and cannot start with a number3, as far as possible to see the name of the ideaVI. Bash configuration files1. Profileclass : Provides configuration for the interactive login shell process.• Valid profiles for all users are globally valid:/etc/profile and/etc/profile.d/*.sh• Only the profile that is valid for the current user is valid for the user: ~/bash_profileNote: The function of profile type configuration file:(1) To define environment variables(2) run

.txt[[emailprotected] sbin]# ./05.expect 192.168.242.129 /tmp/123.txtspawn rsync -av /tmp/123.txt [emailprotected]:/tmp/123.txt[emailprotected]‘s password: sending incremental file list123.txtsent 71 bytes received 31 bytes 204.00 bytes/sectotal size is 0 speedup is 0.00Iii. building a file distribution system Requirements background: For large companies, there must be a site or configuration file updates from time to time, and the use of the machine is certainly a lot of units, fewe

% $Y 3 · [Email protected] ~]# ycube=expr $Y \* $Y \* $Y [Email protected] ~]# echo $Ycube 4096 · ################### #Position variable #################### represented as $n, n is a number between 1~9 · [Email protected]/]# VI add.sh #!/bin/bash sum=expr $1 + $2 echo "$ + $ = $SUM" · [Email protected] ~]# chmod +x add.sh · [Email protected]/]#./add.sh 12 34 12 + 34 = 46 · ################### #Predefined variable #################### $#: Number of positional variables in the command line $: The

Caimont The idea of writing an article, after receiving the strong support of Mr. Hongbin of Chinabyte Network College, you will be able to see this article. The author earnestly hopes that through this article for the vast number of WEB developers and enthusiasts to provide convenience, to enable everyone to participate in the study and exchange of ASP, in order to cover the needs of readers at different levels the author decided to start from the most basic

$iDoneEcho Program Endsteps:Step One: Scripting sum.sh1) Writing script files[Email protected] ~]# vim sum.sh#!/bin/bashWhile read-p "Please enter an integer to be accumulated (0 means end):" XDo[$x-eq 0] breakSUM=$[SUM+X]Doneecho "sum is: $SUM"[Email protected] ~]# chmod +x chkint.shStep two: Write the sum.sh script file1) Writing script files[Email protected] ~]# vim mysum.sh#!/bin/bashI=0While [$i-le 20]DoLet i++[$[i%6]-ne 0] continueEcho $[i*i]

, and the shell interprets the execution.• Batch processing (Batch): The user writes a shell script in advance, with many commands that allow the shell to execute the commands one at a time without having to hit the command one by one. Shell scripts and programming languages are similar, there are variables and process control statements, but shell scripts are interpreted to execute, do not need to compile, the shell program from the script to read and execute the command line, the equivalent o

Permissions 1387.4.2 Changing affiliation 1397.5 Sharing Files 1407.6 Summary 1428th. Managing File Systems8.1 Exploring Linux File Systems 1438.1.1 Basic Linux File System 1438.1.2 Log File System 1458.1.3 copying a file system when writing 1478.2 Operating the file system 1478.2.1 Creating a Partition 1478.2.2 Creating a file system 1518.2.3 File system inspection and Repair 1538.3 Logical Volume Managem

Guide As is known to all, system administrators need to be proficient in a scripting language, and the job requirements listed by the recruiting organization will also be written. Most people think that Bash (or other shell language) is handy, but some powerful languages (like Python) can give you some other benefits. First, we'll use Python's command-line tools, and we'll be exposed to Python's object-oriented features (the latter par

Objective ----  This article comes from the 29A Virus magazine, it has a comprehensive elaboration to the Linux shell virus technology, I do not want to translate it, I take its that article as the template Write this article in Chinese, the code inside I have done debugging.  for Shell programmers, the so-called shell virus technology is actually a calf, this point after you have read this article will have some experience But, simple to return to

This is a creation in Article, where the information may have evolved or changed. People in ' Cloudflare ' are very fond of the Go language. We are in many [internal software projects] (https://blog.cloudflare.com/what-weve-been-doing-with-go/) and larger [piping systems] (https:// blog.cloudflare.com/meet-gatebot-a-bot-that-allows-us-to-sleep/) used in it. But can we go to the next level and use it as the scripting language of our favorite OS

Summary of popular Linux and Windows Script language lists: system administrators with script knowledge are significantly different from other system administrators. Script is an art created by system administrators. There are many options for system administrators to write scripts. each script language has its own unique syntax and advantages... Summary of popular Linux and Windows Script language lists: s

2017 09:48:22 +0800from localhost [127.0.0.1]-----The following addresses had permanent fatal errors-----[email protected]>(reason:550 Failed to connect remote host.)-----Transcript of Session follows-----... while talking to mx3.qq.com.:... while talking to mx2.qq.com.:So the machine was restarted a bit. You can do it.[Email protected]:/var/mail$ Echo]20171204tete" | Mail-s "TEst2"Xcy[Email protected]:/var/mail$ Mail"/var/mail/xcy": 3 messages 1 new 2 unreadU 1 Mail Delivery Subs December 4 10

Summary of popular Linux and Windows Script Language lists: system administrators with Script knowledge are significantly different from other system administrators. Script is an art created by system administrators. There are many options for system administrators to write scripts. Each script language has its own unique syntax and advantages. There are almost no similarities between scripting languages, b

directly behind the. BASHRCfunction Addem{Echo $[$ [+ $]}This function is used anywhere on the system.2. Reading function filesYou can use the source command to add a function from the library file to the. BASHRCAdd it directly behind the. BASHRC. /home/xcy/myfuncsSo you can use the function inside the Myfuncs.17.8 exampleThis section describes the GNU Shtool Shell script function library. The Shtool library provides a few simple shell scripting libr

echo "Top Ten Disk Space Usage" echo "for $CHECK _directories Directory" For Dir_check in $CHECK _directories Do echo "" echo "The $DIR _check Directory:" Du-s $DIR _check 2>/dev/null | Sort-rn | Sed ' {one, $D; =} ' | Sed ' N; s/\n//' | Gawk ' {printf $ ': "\ T" $ "t" $ "\ n"} ' Done Exit [Email protected]:~/shell/24zhang$ Run:./big_user.shOnly two directories/var/log/home are specified above, and the generated report is disk_space_$date.rpt here.This script

1#!/bin/Bash2 ############################################3# @content Chapter8,9of Linux Command line and Shell Scripting Bible4 # @reader Gavin5# @date the/ A/ -6 ############################################7CHAPTER88 9+user varriable make the shell A-computer programTen 1when assigning a value to a user-defined variable, no spaces can appear One 2. Shell script automatically determine the data typ

From a programmer's point of view, the shell itself is a program written in C language, from the user's point of view, the shell is the user and the Linux operating system communication Bridge. Users can either enter command execution and use shell scripting to accomplish more complex operations. In the Linux GUI increasingly perfect today, in the system manageme