环境变量查看与设置

查看

export

declare -x HISTCONTROL="ignoredups"
declare -x HISTSIZE="1000"
declare -x HOME="/root"
declare -x HOSTNAME="bogon"
declare -x KDEDIRS="/usr"
declare -x LANG="zh_CN.UTF-8"
declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"
declare -x LOGNAME="root"
declare -x MAIL="/var/spool/mail/root"
declare -x OLDPWD="/usr/local/php/bin"
declare -x PATH="/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin"
declare -x PWD="/etc/profile.d"
declare -x QTDIR="/usr/lib64/qt-3.3"

...................

单独查看path

用echo $PATH

[root@bogon profile.d]# echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

临时添加

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

永久添加

vim /etc/profile
在文档最后，添加:
export PATH="/usr/local/php/bin:$PATH"
保存，退出，然后运行：
source /etc/profile
不报错则成功