Linux Learning-Shell Basics-Bash basic features

　　

Historical command

　　History

-C Clear

-W Write ~/.bash_history

Save 1000 By default, can be modified in /etc/profile

Call

　　　　　　

TAB completion

commands, directories, files

Command aliases

Alias aliases = ' Original command '

Command execution order:

Absolute path or relative path > alias > Bash's internal command > The first command found in $PATH environment variable (external command)

Configuration file:/ROOT/.BASHRC

Delete: Unalias aliases

Common shortcut keys

　　

Input and output redirection

　　Standard input and output

　　　　

　　Output redirection

　　　　

Note: There are no spaces between 2 and >!

　　　　

Command &>/dev/null the results into the trash.

　　Input redirect

Example: WC [options] [filename]

-C Statistics byte number

-W statistical number of words

-L count rows

Sequential execution of MULTIPLE commands

　　

DD is primarily used for disk-to-copy

　　　　

Command && echo yes | | Echo No

Pipe symbol |

Command 1 | Command 2 The correct output of command 1 as an object of command 2

Example: Ll-a/etc/| More

Netstat-an | grep "established"

　　　　　　　　

Wildcard characters

　　

Other special symbols in bash

　　

Linux Learning-Shell Basics-Bash basic features