Set environment variables for centos and environment variables for centos

Set environment variables for centos and environment variables for centos

Method 1: Add a variable to the/etc/profile file [effective for all users (permanent )]

Use VI to add a variable to the/etc/profile file. This variable will be valid for all users in Linux and will be "permanent ".

[Root @ CentOS ~] # Vi/etc/profile

Add the following two lines of code to the end of the file:

PATH =/usr/local/webserver/php/bin: $ PATH

Export PATH

#/Etc/profile

# System wide environment and startup programs, for login setup

# Functions and aliases go in/etc/bashrc

# It's NOT a good idea to change this file unless you know what you

# Are doing. It's much better to create a custom. sh shell script in

#/Etc/profile. d/to make custom changes to your environment, as this

# Will prevent the need for merging in future updates.

Pathmunge (){

Case ": $ {PATH}:" in

*: "$1 ":*)

;;

*)

If ["$2" = "after"]; then

PATH = $ PATH: $1

Else

PATH = $1: $ PATH

Fi

Esac

}

If [-x/usr/bin/id]; then

If [-z "$ EUID"]; then

# Ksh workaround

EUID = 'id-U'

UID = 'id-ru'

Fi

USER = "'id-UN '"

LOGNAME = $ USER

MAIL = "/var/spool/mail/$ USER"

Fi

# Path manipulation

If ["$ EUID" = "0"]; then

Pathmunge/sbin

Pathmunge/usr/sbin

Pathmunge/usr/local/sbin

Else

Pathmunge/usr/local/sbin after

Pathmunge/usr/sbin after

Pathmunge/sbin after

Fi

HOSTNAME = '/bin/hostname 2>/dev/null'

History Size = 1000

If ["$ HISTCONTROL" = "ignorespace"]; then

Export HISTCONTROL = ignoreboth

Else

Export HISTCONTROL = ignoredups

Fi

Export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL

# By default, we want umask to get set. This sets it for login shell

# Current threshold for system reserved uid/gids is 200

# You cocould check uidgid reservation validity in

#/Usr/share/doc/setup-*/uidgid file

If [$ UID-gt 199] & ["'id-gn '" = "'id-un'"]; then

Umask 002

Else

Umask 022

Fi

For I in/etc/profile. d/*. sh; do

If [-r "$ I"]; then

If ["$ {-# * I }"! = "$-"]; Then

. "$ I"

Else

. "$ I">/dev/null 2> & 1

Fi

Fi

Done

Unset I

Unset pathmunge

PATH =/usr/local/webserver/php/bin: $ PATH

Export PATH

If the modification takes effect immediately, run the following code:

[Root @ CentOS ~] # Source/etc/profile

Method 2: Add a variable to the. bash_profile file in the user directory [effective for a single user (permanent )]

Use VI to add a variable to the. bash_profile file in the user directory. The change volume is valid only for the current user and is "permanent ". The specific operation is the same as that in method 1. The code is not listed here.

Method 3: run the export command to define the variable [only valid for the current shell (BASH) (Temporary )]

Use the [export variable name = variable value] to define a variable under the shell command line. This variable is valid only in the current shell (BASH) or its subshell (BASH, when shell is closed, the variable becomes invalid. This variable is not available when a new shell is opened. You need to define the variable again if necessary. For example

Export PATH =/usr/local/webserver/php/bin: $ PATH