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Here is a bash script compilation tutorial written by old American. It is very good. At least I have never touched bash and can understand it!Create a scriptLinux has many different shells, but we usually use Bash (Bourne again shell) for
Arithmetic operations are undoubtedly very important in shell scripting programming;The command to perform an integer arithmetic operation in bash is let, which has the syntax format:Let Arg ...Arg is a complete arithmetic expression consisting of a separate arithmetic expression, such as +,-,*,/,%,^;where ^ is the square operation, such as 2^3 represents 2 of th
This article is part of the Linux Shell Series Tutorial series, which includes the following 18 parts: Linux Shell Series Tutorial (a) Shell introduction Linux Shell Series Tutorial
Tags: shell script1, write script/root/bin/systeminfo.sh, display the current host system information, including hostname, IPV4 address, operating system version, kernel version, CPU model, memory size, hard disk size#!/bin/bashecho "hostname: `hostname`"echo "ipv4 addr: `ifconfig |egrep -o "\2, scripting/root/bin/backup.sh, can be implemented to backup/etc/directory to/ROOT/ETCYYYY-MM-DD#!/bin/bashecho "co
we use is the bash shell, the script file extension is. sh, the first line needs to write #!/bin/bash.Executed, it should be done in a manner such as./xxx.sh2. NotesA line beginning with ## This line is a note3. VariablesDeclaration of a variableWhen declaring, the format is the variable name =Note that there can be no spaces between the variable name and the equals sign, and the variable name is not prece
, which is represented as a local variable. such as local temp=1 .Example 3. Array Parameterstest3.sh#!/bin/bash Span class= "hljs-comment" ># trying to pass a array variable function testit {local newarray # use ' local ' define a local variable newarray= (' echo " the NewArray value is ${newarray[*]} "}myarray= (1 , 2 , 3 , 4 , 5 ) echo "the original array is:${ Myarray[*]} " testit $myarray Test:sh test3.shOutput:The original array is:1,
value of a running process Renice-n PIDNohup SH executes scripts in the backgroundCtrl Z hangs a foreground processFG Job Number The file foreground runs the BG job number to run the file background/proc DirectoryShell Scripts Scripta shell script is a text file that contains a shell directiveShell and oh ah this supports variables with simple syntax to complete batch workHow
Tags: Ignore program linu a share picture strong edit contains technology sharingOne$BASH The path of the Bash 's binary program file Two$BASH_ENVThis environment variable will point to a bash startup file that will be read when a script is called.Three$BASH_SUBSHELLThis variable is used to indicate the level of the child
Very depressed, do not know what the reason, on the virtual machine to get that, the Centos6.5 seems to make a problem, the use of SSH remote landing on the CentOS, only show:bash-4.1#, very strange, whoami the root permissions displayed, PWD display /root plus the # prompt, it does indicate that this is the root user, but not the same as when we landed. Can be sure is the root of the user's configuration file error, or mistakenly deleted, because the day before yesterday I have been following t
First, the basic writing process of the practice script:1. Determine the task and the command to complete the task2. Scripting Integration Tasks3. Authorization and test executionSecond, exercise:A. First I create a directory, put the script we write into, so it's not too messy[Email protected] ~]# mkdir-p/root/bin[Email protected] ~]# Cd/root/binB. Start compiling below[Email protected] bin]# VI sysinfo.sh#!/bin/
command prompt after receiving a message26.1.2 Creating a scriptThere are several steps1) First check whether the user is logged in2) Check whether the user can receive messages3) Check if the message you want to send is included4) Send MessageThe code is as follows: [Email protected]:~/shell/26zhang$ Cat mu.sh #!/bin/bash Muser=$1 logged_on=$ (who | grep-i-M 1 $muser | gawk ' {print $} ') #
$today ' today= ' Date +%h:%m:%s ' echo ' Now is $today ' today= ' date ' +%y-%m-%d%h:%m:%s ' ' echo ' now $today ' tomorrow= ' date-d tomorrow "+%y-%m-%d%h:%m:%s" ' Echo ' Tomorrow is $tomorrow "yesterday= ' date-d yesterday " +%y-%m-%d%h:%m:%s "' Echo ' Yesterday is $yesterday "[email protected]:/data#./demo6 Thu Dec 1 20:45:05 CST 2016now are 2016-12-01now are 20:45:05now is 2016- 12-01 20:45:05tomorrow is 2016-12-02 20:45:05yesterday was 2016-11-30 20:45:05 Output RedirectionSend the ou
Like many of my classmates, I was confused shell programming before I learned shell programming, but I didn't know what it could do, but I felt I could use a different way to manage the system. Now I slowly understand the importance of the shell for a small room inside a small shell monitor enough, of course, large-sca
Article title: Linux programming-11. ShellScript (bash) -- (2) Tutorial example. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. "Hello world" Shell Script According to the traditional program teaching example, this section de
I. DEFINITION of format[Function] Function name (){Command table}Ii. Method of InvocationFirst define, then use, direct input function name, no parentheses required ()Three, function parameter transfer methodCan be passed using positional parameters or variables#!/bin/bash# myfirst.shtestfunction () {echo"$1,$2" #positional parameter passing parametersEcho"$val 1, $val 2" #Variable pass parameter}val1="test1"Val2="test2"testfunction1 2#calling Functio
to access badfile: No file or directoryIf you need to redirect both standard output and standard errors to a file, separate processing is required, such as:ls 2 1> TestThis redirects the error prompt and the standard output to a different file. The bash Shell provides a special redirect > can redirect the output of stderr and stdout to the same file. (3) Redirect output in script temporary re-training: If
Tags: = = Directory interaction problem type date put. bashrcShell Scriptdking~ sharing1.1 Scripting ConceptsPut multiple commands into a single file to facilitate one-time execution of a program fileUnified Script Storage Directory:/server/scriptsUsing Vim to edit scripts is recommendedTo view the script execution process: Sh-x script1.2 Script editing format:#!/bin/bash#author: DQF#date: 2018/1/11#ver: 1.
Text processing commands for Shell scripting Learning notesA. Cut (truncate text characters or field fields)Command format: Cut [option] FileCombined use of 1.-d and-F to intercept fieldsDescription: * denotes delimiter, such as-,:, empty characters, etc.n Denotes nth fieldUsage One: cut-d*-fn to intercept a field from the text for each line that is delimited by a particular symbolExample: Cut-d:-f1 interce
instruction (displays the exit status of the last command. 0 means no error, any other value indicates an error)$-shows the current options used by the shell, same as the SET command function[email protected] is similar to $*, but can be used as an array--------------------------------------------------------------------------------------------------#!/bin/sh##############Export lang= "ZH_CN. GB18030 "Export JAVA_HOME=/USR/LOCAL/JDKExport path= $JAVA
Shell implementation of multi-level menu scriptingOriginal: https://www.yuanmas.com/info/2gOwBPvqyb.htmlThis article mainly introduces the shell implementation of multi-level menu system Installation script instance sharing, this script with multi-level menu to achieve lamp, LNMP installation display effect, the need for Friends can refer to:Hint: This script mainly realizes multi-level menu effect, and doe
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