环境变量的配置方法

1.在用户目录下的.bash_profile中添加（在当前用户有效）：

# .bash_profile

# Get the aliases and functions

if [ -f ~/.bashrc ]; then

        . ~/.bashrc

fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH

export a=123 #新添加环境变量

[root@localhost ~]# . .bash_profile

[root@localhost ~]# echo $a

123

[root@localhost ~]# su - cjf #切换用户

[root@cjf ~]$ echo $a #打印出来的是空置

2.在etc/profile中添加（对所有用户都有效）

 /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

}

export b=789 #新添加环境变量

[root@localhost ~]# . /etc/profile

[root@localhost ~]# echo $b

789

[root@localhost ~]# su - cjf #切换用户

[root@cjf ~]$ echo $b  #必然能打印出来值

789

3.在/etc/bashrc中添加

环境变量的配置方法

原文：http://quguanhai.blog.51cto.com/1951497/1793109