environment variable profiles for systems and users

A configuration file /etc/profilethat specifies the environment variables, which represent system-related environment variables

Note : But to change certain environment variables, it's best to define and write your own shell under/etc/profile.d/.

It is best not to change the/etc/profile file.

Like defining a path.sh.

[Email protected] ~]# vim/etc/profile.d/path.sh

#!/bin/bash

Export path= $PATH:/tmp/:/data/bin/#自己新定义的PATH

Reset and take effect

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

[Email protected] ~]# echo $PATH

/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/tmp/:/data/bin/

Another configuration file /ETC/BASHRC, will be defined Ps1,umask (/etc/profile file is also defined)

Note : This file is best not to be modified; it's better to define it under/etc/profile.d/and write your own shell.

View PS1

[Email protected] ~]# echo $PS 1 #PS1定义的我们命令的前缀

[\[email protected]\h \w]\$

Change the PS1, replace W to W, the difference is that W will show the absolute path, and W will show the last segment of the path

[[email protected] ~]# ps1= ' [\[email protected]\h \w]\$ '

[Email protected] ~]# cd/etc/init.d/

[Email protected] /ETC/INIT.D]#

[[email protected]/etc/init.d]# ps1= ' [\[email protected]\h \W]\$ '

[Email protected] init.d]# cd/etc/init.d/

[Email protected] INIT.D]#

You can also add time \ t

[[email protected] init.d]# ps1= ' [\[email protected]\h\ t \w]\$ '

[Email protected]19:29:31 init.d]#

Root user is # Normal user is $

[Email protected] ~]# Su-wyy

[Email protected] ~]$

/etc/profile,/ETC/BASHRC is about the system level. In addition to these two, there are some in the user's home directory, you can use Ls-la.

You can see a few that start with. Bash. The . Bash_profile file and our system's/etc/profile file are a class of files, much like. /etc/profile

A configuration file that can be used by any user, and if you want to define some environment variables for the user, you can

. Bash_profile to define.

. BASHRC This defines the user's alias, which is executed when the user logs on and every time a new shell is opened.

Note : . BASHRC will be called by. Bash_profile

If you define a variable in the. BASHRC and then unset the variable in. Bash_profile, then when we log in to a terminal, echo the value of the variable is empty

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environment variable profiles for systems and users