bash history

' input ll equals ls-l command11.Unalias: Cancel alias Eg:unalias ll12. History: Historical command history [n] N: Representing numbers, listing the last n commandsHistory [-craw] Histfiles-C: Empty all current History content-r: Read Histfiles's contents into the current Shell's history memory-W: Writes current

Shell commonly known as shell (used to distinguish from the kernel), refers to the "user interface to provide users" command parser (software). It is similar to DOS command and later cmd.exe. It receives the user command and then invokes the appropriate application.At the same time, the shell is a programming language. As a command language, it interactively interprets and executes commands entered by the user, or automatically interprets and executes a predetermined sequence of commands. The sh

commands,Hisfilesize defines the maximum history file size,The Histcontrol definition ignores leading spaces,Histingore defines a command that does not need to be stored, where ignoredups ignores duplicate rows, Ignorespace ignores lines with leading spaces, Ignoreboth ignores bothHistfile Defining History filesShell all parameters $* [email protected] the latter is separate, remember to use double quotati

back to the foreground. Of course, it is very convenient to switch front and rear with BG and FG commands. 3, Ctrl+d is to send an exit signal, not so strong, like Ctrl + C operation, such as you from administrator root back to your ordinary users can be used. Clear: Clears the terminal screen Commands are made up of: commands, options, parameters The TAB key is used to complement the full file (folder) name, command Press the arrow key "up" or ctrl+p to repeat the last command

The default shell for Linux and Mac systems is bash, but the really powerful shell belongs to zsh, and full monitoring of Bash is the ultimate killer in the shell, with a lot of features that bash doesn't have, but the initial configuration of zsh is too cumbersome, the prevalence is not high, Until a guy named Robby Russell developed the OH-MY-ZSH project on Git

:- C: empty command history-D: Delete the specified command history, offset [n]-W: Saves the command history of the buffer to the history file/home/username/.bash_history !n: Executes the nth command in the command history!-n: Executes the last nth command in the command

BASH built-in Variables(1). BASHFunction: complete bash path. The default value is/bin/bash.(2). BASH_ENVPurpose: applicable only in non-interactive mode. When executing a shell script, the system first checks whether the variable has been specified to startScript. If it is specified, run the specified STARTUP script first.(3). BASH_VERSIONRole:

For the overall structure of the operating system, the shell is the closest to the user program, is also the operating system and the user can interact with the program.The shell in its broadest sense consists of two categories:Gui:gnome,kde,xfceCli:sh,csh,ksh,bash,tcsh,zshRoot,studentProgram: ProcessProcess: In each process it appears that only the kernel and the current process exist on the current host: no awareness of the existence of other proces

Bash script code for obtaining computer hardware configuration information in Linux Recently, to obtain the hardware configuration information of Several Linux servers, I wrote a script code to obtain the hardware configuration information, including the number of cpu cores, memory size, and hard disk size, the Code is as follows: #! /Bin/bash## Description:# Used to get the hardware config information.##

Course connection: Basic command line BASH operations Shell 1. Shell is an intermediary between the user and the underlying operating system (usually the kernel). It is responsible for transmitting user commands and operations to the underlying operating system. 2. There are two types of Shell: CLI and gui cli: Command Line Interface-Command Line Shell (Linux) GUI: Command Line Interface-graphical Shell (Mac, Windos default Management Mode) in Linux,

Bash FeaturesUser working environment: root # Normal User $Shell Child shell can open multiple bash and exit with exit Command history, Historical histsize command history size, default 1000 bar-C Empty Command history-d specifies the line number to delete command keep p

screen Clear all History history-c #清除内存中的命令历史rm ./bash_history #删除历史文件中的内容HISTSIZE =0# Clears the memory history by modifying the history command bar number Other options history[-c][-doffset]history