learning bash shell

The terminal on Mac uses the Bourne-again shell command, bash for short. Bash is a project developed and promoted by GNU.Extended Bourne shell Bourne shellIs the original shell used by UNIX, authorSteven Bourne Bash is the inte

(kw:process Substitution)> (cmd list)7. Path name expansion (Kw:pathname Expansion)*, ?, []Expand, expand, not unfold, and remain intact.6. Redirection (1.5), (kw:redirection)Before a command executes, its inputs and outputs may be redirected by the shell, and the redirection operation has the following functions:redirect Input (kw:redirecting input, here Documents, here Strings)Wc-l CMD ..EofCMD Redirected outputs (kw:redirecting output)Copy file de

Install bash shell and solarisbashshell on solarisA bash vulnerability exists in earlier versions of sun solaris, which can be solved by uninstalling or upgrading.1. All pkg installation packages:Http://mirror.opencsw.org/opencsw/allpkgs/ 2, download Installation :#Gunzip bash-4.3.33,rev1_2015.02.15-sunos5.10-sparc-csw

I am a new Linux user. Now I need to clean up a download directory of files, in fact, I just want to delete from the ~/download/folder except for files in the following format, other files: 1.*.iso-all ISO format files.2.*.zip-Files in all zip formats. How do I remove a specific file from a bash shell on a linux,os X or unix-like system? The Bash

First, the Bash Shell Basic Operations Command 1.type: See if the command is a built-in command of the Bash shell type cd2.Echo: The display of the variable echo $ variable echo name3.unset: Cancels the variable you just set unset name4.Envor SET command to view environment variables5.ExportChange the custom variable t

CentOS under the shell display-bash-4.1$ does not display the user name path resolutionProblem Description:A new user is added under CentOS, and the shell script information is as follows when logged in:650) this.width=650; "src=" Http://up.2cto.com/2013/0605/20130605091807247.jpeg "style=" border-width:0px;padding:0 px;margin:0px;list-style:none;width:118px;heig

Under Ubuntu I wrote a shell script with bash to grammar (exactly the script on the computer), under Ubuntu, with SH test.sh to run, but there are unexpected results, such as ECHO-E "\ntest\n" to the execution is different, Run directly with the SH test.sh, the-E (as a string) is printed, and the Echo-e "\ntest\n" is not output "-e" directly in the terminal.I was wondering what the reason was, and then fina

Objective I'm sure everyone knows bash. Time is a useful command that can be timed for a script or a program's execution, which is usually handy when you are roughly comparing the execution efficiency of a program. However, you will find that the time text of the command output cannot be simply redirected, such as redirecting to a text file that can only be displayed on the screen, which is inconvenient for non-interactive timing. For example: $ time

Linux Command -- bash shell configuration, linuxbash I. shell Type From the perspective of user login, shell types include: 1. logon shell: (read environment configuration) Normally log on through a terminal: Su-USERNAME Su-l USERNAME 2. Non-Logon

How to write bash Shell CGI under uhttpdcgi Target Reference WWW ROOT Dir on OpenWRT Browser Client Access TargetWant to provide the Smaple RESTful server under UHTTPD on OpenWRT, I-Select the bash script for a demoReferenceBash CGIWeb CGI with Bash ScriptPostMan TesterWWW ROOT Dir on OpenWRT/

The Shell is process-oriented(Bash for example)Variables are process variables, process ends, and variables disappear.Bash Variable type:Environment variablesLocal variables (local variables):Positional variablesSpecial variablesLocal variables: Set Varname=value scope for the entire bash processLocal variables:local Varname=value scope is the current code snippe

$lineDone Note: Because the use for to read in the file line, will automatically put the space and newline characters as the same delimiter, if there are spaces in the line, the output will be very messy, so only for the row can not have spaces or newline characters of the file To read a file using a while loopCat File.txt |while Read lineDoEcho $lineDoneOr:While Read lineDoEcho $lineDone Note: Because a while is used to read a row in a file, it rea

When you are using some commands, such as: LS, git, just met some requirements is to easily traverse all the directories and files, and then after the search, finally found a "magic" wildcard "* *" (two asterisks), after setting the bash globstar option, * * You can match any current directory (including subdirectories) and the files in it. So, to understand the Globstar this option, when not set Globstar, * * Wildcard function and * is the same, and

This article is also the sixth chapter of "learning the bash shell" 3rd edition, command-line options and typed varilables, but we will not limit this article. The array element can be a string or number, the same as the variable. The index of the array starts from 0. The maximum value is 599147937791. Basically, there are no restrictions. Definition Method You

Bash tips are greatly subsidized. Now, Linux's default shell-general Linux technology-Linux programming and kernel information is shown below for details. Bash is a Shell program that we often deal with. This article provides a collection of its usage skills. I believe that after you read this content, it will certainl

Article title: shell introduction to bash programming variables. 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. The variable format of the Bourne Shell is only a string variable. therefore, to use numeric operations, you must

passwd Modify the password for a system user account Ps Displays information about processes running on the system Pwd Show current directory Renice To modify the priority of applications running on the system Rm Delete the specified file RmDir Delete the specified directory Sort Organizes data in a data file based on the specified order Stat Di

In this case, it is usually a shell script written under window and copied to the Linux machine for execution to occur.The reason is:The end of each line under Windows is \n\r, and the end of the file under Linux is \ nThis allows window to write an edited shell script when it is copied to LinuxThe end of each line will be more than one character. \ rThis \ r character will be displayed as ^mSo the error me

Tags: mil key export own method keyword Tle title-bash-4.1The path is not shown in the Linux shell, and it is inconvenient to use it as a-bash-4.1#.How do I change the shell to show the path?The steps are as follows:Vim ~/.bash_profile(No tube. Bash_profile This file has a few, you can create a new one is also possible

Preface or Today write a self-starter packaging script. Used to get the last file name from the path name. Here is a record of the implementation process.Of course, in the end I will also give the official approach. (PS: Very embarrassing, realized that the original bash Shell has a ready-made function)Gets the file name if the given path name is:/tmp/csdn/zhengyi/test/zhengyi.txtThe awk solution uses a "/"