Linux之export命令

> export -p
declare -x CLASSPATH=".:/opt/java/jdk1.8.0_231/lib:/opt/java/jdk1.8.0_231/jre/lib"
declare -x HISTCONTROL="ignoredups"
declare -x HISTSIZE="1000"
declare -x HOME="/root"
declare -x HOSTNAME="JD"
declare -x JAVA_HOME="/opt/java/jdk1.8.0_231"
declare -x JAVA_OPTS="-server -Xms4096m -Xmx4096m -XX:PermSize=256M -XX:MaxNewSize=512m -XX:MaxPermSize=512m"
declare -x JRE_HOME="/opt/java/jdk1.8.0_231/jre"
declare -x LANG="en_US.UTF-8"
declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"
declare -x LOGNAME="root"

> export RUMENZ

> export RUMENZ=7

> function func_1(){ echo "123"; }

> func_1
123

> vim test.sh
#!/bin/bash
func_1

//执行这个脚本,报错
> bash test.sh
test.sh: line 3: func_1: command not found

> export -f func_1
//查看定义的函数

> export -pf
func_1 () 
{ 
    echo '123'
}
declare -fx func_1

> export -fn func_1
//再执行脚本
> bash test.sh
test.sh: line 3: func_1: command not found

/etc/profile
/etc/profile.d/*.sh
/etc/bashrc

> vim /etc/profile


# 在最后加上
export JAVA_HOME=/usr/local/jdk1.8
export PATH=${JAVA_HOME}/bin:$PATH

//立即生效操作
> source /etc/profile

~/.bash_profile
~/.bashrc

> vim ~/.bashrc

# 最后面加上
export PS1="\u@\h>\s "

//立即生效
> source ~/.bashrc