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

[[email protected] ~]# . .bash_profile

[[email protected] ~]# echo $a

123

[[email protected] ~]# su - cjf #切换用户

[[email protected] ~]$ 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

[[email protected] ~]# . /etc/profile

[[email protected] ~]# echo $b

789

[[email protected] ~]# su - cjf #切换用户

[[email protected] ~]$ echo $b  #必然能打印出来值

789

3.在/etc/bashrc中添加