learning bash shell

command-line mode: For I in {1..10};d o echo $i;d one =========================================== while loop statement usage while condition to meet cond Ition executes the cmd do-cmd-done bash-x to run the script in debug mode to display the script's running process until loop statement usage: Until condition--G t; does not satisfy the condition, then executes the cmd do cmd-done case multi-conditional Judgment Statement usage: Case value in va

Starting today to learn shell programming, when the university learned c,c++, compilation, but long forgotten, I think the algorithm is done, what language is just a tool. Learning here, the class of students, especially a little did not touch the programmer, really very difficult, and the teacher here also out of some tidbits ...Originally taught our teacher cold, the voice is dumb, so let's teach our proj

Linux File SystemLinux speaking files are stored in a single directory structure (virtual directory), and the virtual directory contains the file paths of all the storage devices installed on the PC.The more complex part of the Linux virtual directory is how it coordinates the management of each storage device. The first hard drive installed on a Linux PC is the root drive, creating some special directories on the root drive that we call mount points. Mount points are directories in the virtual

Daniel RobbinsPresident and CEO, Gentoo Technologies, Inc.March 2000 By learning how to program using the bash scripting language, you can make the daily interaction of Linux more interesting and productive. You can also use the familiar and favorite standard UNIX concepts (such as pipelines and redirection ). In this three-part series, Daniel Robbins provides an example of how to program using

One:The shell is the shell of the Linux/unix system, and it can be understood as the command line interface, where you enter and execute the command line.Bash (born again shell) is one of the shell's most commonly used shells. you run on your Linux: PS | grep $$; If you run the result as bash, it means that the current

basis for many derivative shells, many of which are now applied in typical Linux systems. Figure 1 demonstrates the series of important shells. Bourne shell leads to the development of Korn shell (ksh), almshells (ash), and popular Bourne Again shell or Bash. C shell (csh)

Set bash options with built-in set and SHOPT commandsThe set command can be used to customize the shell environment, using the option "O" to turn options on or off. For example, open the options: Set-o option, close the Select item: Set +O option.For example, to open the VI Interactive command-line edit, the following: [Email protected] ~]#Set-o#查看当前设置情况Allexport offBraceexpand onEmacs onErrexi

Bash internal variable learning and Bash variable learning $ SECONDS variable --------- number of SECONDS after the script has been run. Script instance: 1 #!/bin/bash - 2 #=========================================================================================== 3 # 4 # 5

Learning bash notes-input and output, bash hide output1. I/O redirection The I/O redirection is as follows: Cmd1 | cmd2: pipeline that receives the standard output of cmd1 as the standard input of cmd2. > File: redirects standard output to file. > File: redirects the standard output to file. If the file exists, it is appended > | File: Even if nocl

configuration will be very troublesome. Even the X-Window Interfaces set by different release versions are different, and learning is also difficult. In addition, the text interface transmission speed is relatively fast during remote connection.The most important thing is that it gives you a better understanding of Linux. As a general user, only learning the operation interface can solve the vast majority

************************************************************************* * * * Original:blog.csdn.net/clark_xu Xu Changliang's Column************************************************************************? time to read the file#!/bin/bashFor file in ' Ls/root 'DoStat $file >1.txtSed-n "7p" 1.txt>2.txtUsetime= awk-f ":" ' {print $2.txt} 'echo "Time=" $file $usetimeDone? reads each line of the file while statement. Cat Afile | While Read onelineDoEcho $onelineDone? reads each line of the file

Bash shell Script Introduction Shell Runtime EnvironmentIf you're running a Unix or Linux system, such as Ubuntu,red Hat,suse Linux and MacOS, it's built-in bash shell, so you don't need to configure the so-called development environment.My