环境变量设置无法生效？

[weixin_38052215]

设置了环境变量，只能在当前Terminal里存在，不能永久生效，怎么解决呢？
[oracle@linc ~]$ more .bash_profile
# .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
unset USERNAME

# umask 022

[oracle@linc ~]$ export ORACLE_BASE=/u01/app/oracle
[oracle@linc ~]$ export ORACLE_HOME=$ORACLE_BASE/oracle/product/10.2.0/db_1
[oracle@linc ~]$ export ORACLE_SID=orcl
[oracle@linc ~]$ source .bash_profile
[oracle@linc ~]$ more .bash_profile
# .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
unset USERNAME

# umask 022

[oracle@linc ~]$