Linux Essentials -06,linux Bash features

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Bash and its features

Shell Shell

Clt:sh csh ksh bash tcsh zsh

Relationship between programs and processes: One program, multiple processes

Process: Each process, the current host only has the kernel and the current process

A process is a copy of a program, and a process is an execution instance of a program

User working environment

Bash

Shell and child shell

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Bash supports the following features

1, Command history

2, Pipeline redirection

3, naming aliases

4, command-line editing

5, Command line expansion

6, File name wildcard

7, variable

8, programming

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9, command-line editing

Support Command cursor jump

CTRL + A: Jump to the beginning

Ctrl+e: End of line

Ctrl+u: Deleting the beginning of a line

Ctrl+k: Delete End of line

Ctrl+l: Clear Screen

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10,history

-A: Append to/root/.bash_history

-C: Clear command history

-D: Delete the command at the specified location

-W: Cover/root/.bash_history

Command history Usage Tips

!n: Execute nth in the command history

!-n: Executes the last nth rule in the command history

!: Executes the previous line

!string: Executes the last command in the command line that starts with the specified string

!$: Reference the last parameter of the previous command

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11, Command completion

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12, Catalog completion

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13, Command alias

Alias

[[email protected] ~]# alias

Alias cls= ' Clear '

Alias cp= ' Cp-i '

Alias l.= ' ls-d. *--color=auto '

Alias ll= ' Ls-l--color=auto '

Alias ls= ' ls--color=auto '

Alias mv= ' Mv-i '

Alias rm= ' Rm-i '

Alias Which= ' Alias | /usr/bin/which--tty-only--read-alias--show-dot--show-tilde '

[[email protected] ~]# alias cls= ' Clear '

[[Email protected] ~]# CLS

Cancel Alias

[Email protected] ~]# Ualias CLS

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14, Command replacement $

[[email protected] ~]# echo "It is the Dirctory $ (PWD)"

It is the Dirctory/root

Create Time-named files

[Email protected] ~]# touch/tmp/file-$ (date +%f-%h-%m-%s). txt

[Email protected] ~]# ls/tmp/

File-2016-11-15-19-10-06.txt ssh-igeaz44692 testcp T.txt

Lost+found T1.txt Tmp.txt

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15,bash Supported Quotes

Anti-quote ': command substitution

Double quotation mark "": Weak reference

Single quote ': Strong reference

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16, filename wildcard GLOBBISG

*: Any character of any length

？ : Single arbitrary character

[]: matches a single character within a specified range

[Abc],[a-z],[a-z],[0-9],[a-za-z],[0-9a-za-z]

[: space]: white space characters

[:p UNCT:]: Punctuation

[: Lower:]: lowercase letters

[: Upper:]: Uppercase

[: Alpha:]: Uppercase and lowercase letters

[:d Igit:] Number

[: Alnum:]: Numbers and uppercase and lowercase sections

[[email protected] t]# Man 7 glob

[^]: Any character outside of the match range, the key of the keypad number key 6 shift+6

[Email protected] etc]# ls/tmp/t*

/tmp/t1.txt/tmp/test/tmp/test1/tmp/test2/tmp/tmp.txt/tmp/t.txt

/TMP/TESTCP:

Testcp.txt

[Email protected] etc]# ls/tmp/a*

/tmp/atest2

[Email protected] etc]# ls/tmp/b*

/tmp/btest2

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This article is from the "James Zhan Linux Advanced ops" blog, so be sure to keep this source http://jameszhan.blog.51cto.com/10980469/1873258

Linux Essentials -06,linux Bash features