On the setting of alias of Linux Alias

Alias

Command: Alias

Feature Description: Set the alias of the command

Syntax: alias [command]= ' other commands '

Cases:

[[email protected] data]# alias

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 net= ' Cat/etc/sysconfig/network-scripts/ifcfg-eth0 '

Alias rm= ' Rm-i '

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

Description

① If the logged on user 1 wants to temporarily set an alias, user 1 only needs to perform Alias [command]= ' Other command ', the alias of this command is only valid for user 1, invalid for other users, and user 1 is valid only at that time, the next login expires;

Cases:

YONGHU1 set the alias of RM, alias is temporary valid for YONGHU1;

[[email protected] ~]$ alias rm= ' echo do not use the RM command. '

[Email protected] ~]$ RM/DATA/1.TXT.LN

Don't use the RM command. /data/1.txt.ln

[Email protected] ~]$

YONGHU2 The RM command operation, the RM alias is invalid;

[Email protected] ~]$ WhoAmI

Yonghu2

[[email protected] ~]$ rm/data/1.txt.ln "YONGHU2 the RM alias for RM,YONGHU1 settings is invalid "

Rm:remove write-protected regular file '/data/1.txt.ln '?

YONGHU1 Log off and re-login, last set RM alias is invalid

[Email protected] ~]$ Logout

[Email protected] ~]# SU-YONGHU1

[Email protected] ~]$ WhoAmI

Yonghu1

[[email protected] ~]$ rm/data/1.txt.ln "yonghu1 execute RM again, the RM alias of the last login setting expires "

Rm:remove write-protected regular file '/data/1.txt.ln '?

② If user 1 wants the alias of this login setting to be valid at the next logon, the ~/.BASHRC or ~/.bash_profile . The method is to append alias [command]= ' other command ' to ~/.BASHRC or ~/.bash_profile , and execute source ~/.BASHRC or source . ~/.bash_profile the file into effect. (change ~/.BASHRC or ~/.bash_profile only valid for the current single user, not for other users )

Here is an example of modifying ~/.BASHRC:

YONGHU1 Set RM alias in ~/.BASHRC, alias is valid for YONGHU1;

[[email protected] ~]$ echo "Alias rm= ' echo do not use the RM command." >>~/.bash

[Email protected] ~]$ tail-1 ~/.BASHRC

Alias rm= ' echo do not use the RM command. '

[Email protected] ~]$ source ~/.BASHRC

[Email protected] ~]$ RM

Don't use the RM command.

● yonghu1 re-login, RM alias to YONGHU1 still valid, long-term effective;

[Email protected] ~]$ Logout

[Email protected] ~]$ RM

Don't use the RM command.

● YONGHU2 is executing the RM command, the alias is valid for YONGHU2;

[Email protected] ~]$ RM/DATA/1.TXT.LN

Rm:remove write-protected regular file '/data/1.txt.ln '?

[Email protected] ~]$ RM

Don't use the RM command.

③ if the alias you set is valid for all users, modify the environment variable file/etc/profile or/ETC/BASHRC by appending the alias [command]= ' other commands ' to/etc/profile or/etc/ BASHRC the last row, and corresponding to the execution of the source /etc/profile or/ETC/BASHRC to make the file effective, the operation is permanent, but the general user does not have permission to modify, requires root permission.

Here is an example of modifying/etc/profile :

★YONGHU2 The command to modify/etc/profile, append RM alias to /etc/profile, no permission;

[Email protected] root]$ WhoAmI

Yonghu2

[[email protected] root]$ echo "Alias rm= ' echo do not use the RM command." >>/etc/profile

BASH:/etc/profile:permission denied

......

★ Super User root The RM alias is appended to the /etc/profile, and the RM alias is valid for permanent use in the command to modify/etc/profile.

[Email protected] ~]# WhoAmI

Root

[[email protected] ~]# echo "Alias rm= ' echo do not use the RM command." >>/etc/profile

[Email protected] ~]# tail-1/etc/profile

Alias rm= ' echo do not use the RM command. '

[Email protected] ~]# Source/etc/profile

[Email protected] ~]# RM

Don't use the RM command.

......

★ User 2 in Execute RM command , the RM alias is also in effect;

[Email protected] ~]$ WhoAmI

Yonghu2

[Email protected] ~]$ RM

Don't use the RM command.

[Email protected] ~]$

★ User re-login , and then execute the RM command again, the alias is also in effect;

[Email protected] ~]$ RM

Don't use the RM command.

[Email protected] ~]$

Description

1. /ETC/BASHRC and ~/.BASHRC difference is that/ETC/BASHRC set the equivalent of the laws, set to the whole system,~/.BASHRC is the House rules, set to single-user use;

2.the difference between/etc/profile and ~/.bash_profile is that /etc/profile Set the equivalent of the laws ofset to the whole system;~/.bash_profileis the House rules, set up for single-user use;

3, single user settings including Super User root,root settings ~/.BASHRC or ~/.bash_profile only for root;

4, as for the difference between/etc/profile and/ETC/BASHRC in later in detail, here temporarily can be considered as the laws of the same effect;

5, As for the difference between ~/.bash_profile and ~/.BASHRC in the later in detail, here can be considered as family rules, the effect of the same;

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On the setting of alias of Linux Alias