bash history

History commands are frequently used in linux system management. it is a command with high usage. This topic describes the 15 Usage examples of the history Command. 1. use HISTTIMEFORMAT to display the timestampAfter you execute the history command from the command line, only the serial number of the executed command and the command itself are displayed. To view

Bash and its featuresShell ShellGui:gnome KDE XfaceCli:shell CSH Ksh BashProgram, ProcessProcess: Each process appears to have only kernel and current processes present on the current hostA process is a copy of a program, and a process is a program execution instanceUser's working environment:Bash:# root User$ normal UserShell, child shellBash:1. Command history2. Piping, redirection3. Command-line editing4. Command aliases5. Command line expansion6.

substitution and History commands are expanded). When you're programming with bash scripting, it's enough to understand how the 7 types of strings are generated. When using the command line, it is easier to understand the history command deployment.As you can see in the above picture, there are some unfolding methods that are not useful in strings surrounded by

What is a shell?The shell typically represents two levels of meaning, one is the command interpreter, such as bash, and the other is the shell script. In this section we stand on the command interpreter's point of view to illustrate the shellCommand interpreter shell development history, Sh-csh-ksh-tcsh-bash, let's start with the command interpreter BASH.Priority

plot summary:Dr. Stephen Hawking's "The Universe in the Nutshell" is mainly about the Big Bang Theory,Is the beginning of our universe really the Big Bang?Drama Start:Star Calendar July 11, 2016 17:02:46, the Milky Way Galaxy Earles the Chinese Empire Jiangnan Line province.[Engineer Ah Wei] is working with [machine Xiao Wei] to study [a brief history of the Big Bang Theory of Time].Let's take a look at some things about the Earth:The following basic

A Brief History of JavaScript and a brief history of javascriptBrief history of strongswan JavaScript I. Origin of JavaScript JavaScript is developed jointly by Netscape and Sun. Its first version appeared in the Netscape Navigator 2 browser that exited in December 1995. JavaScript has nothing to do with the Java language. In theory, Java can be deployed in any

No......Even if you delete all the records, you can use data recovery tools to retrieve them.Even if you cover n times with professional tools to make sure the data can't be recovered, the Web site also has a memory of which IP has visited what time. Then run the ISP (Unicom or telecommunications) a check, xx time xx IP to whom?I'll pull you out in minutes.Even, it has been reported before, using big data, only a few behavioral characteristics, you can identify the user identity.It is enough to

Chrome browser. But this is not Dart's death sentence. Google still supports and uses Dart to develop large Web applications because it is more efficient and code-quality than Javascript,dart.In summary, we can see that the web in the development of two trends, the first is to improve the quality of the code from the scripting language level, improve efficiency, the second is to start from the Web standards, provide more abstract modular components, make it easier to write Web applications.And

In ancient China, there were year dates. For example, in Qianlong xx years, the first reliable year of history occurred in the later part of the Western Zhou Dynasty. It was called the first year of the Republic, in 841 BC, baidu records the following: In 841 BC, the West Week entered a short republican period. This year is also the beginning of the year where China's history has a definite chronicle. The

Hello everyone, I'm Jim Springfield. I want to begin to explain our plan, about fundamentally changing C/C ++'s smart perception andCodeHow the browsing function works. Recently, the GDR and vs2008 changes in vs2005 are very important, but they have not implemented these features. ThisArticleIt covers the history of this feature and helps us explain how smart sensing is done in the next release of VC10 (vs2008. Most of the summaries are events in so

History of Python programmers and history of python programmers Factorial algorithm code written by various programmers #-*-Coding: UTF-8 -*- # New Programmer (recursion) Def factorial (x ): If x = 0: Return 1 Else: Return x * factorial (x-1) Print factorial (6) # Programmers with one year of Python experience Def Factorial (x ): Res = 1 For I in xrange (2, x + 1 ): Res * = I Return res Print Factorial (6)

Garbage cleanup Software The computer housekeeper used to use it to clean up trash files is the quickest. Of course, cleaning up the history file is also very good, we can directly use 360 computer administrator. Recently opened documents In the computer's Start menu, there is a history below my document, which can be erased when clicked. XP system 1, we click on the Start menu can be processed. 2,

execute the command from the history] # Cat/etc/RedHat-release fedora release 9 (sulphur) 3. Repeat the previous command quickly There are four ways to execute the previous command again: Use the up arrow key and press enter to execute. Press !! And press enter to execute. Enter! -1 and press enter to execute. Press Ctrl + P and press Enter. 4. Execute a specified command from the command history