.profile works with sh or bash. However .bash_profile is bash-specific and will override .profile if present.

I believe mac OS X environment checks .bash_profile, .bash_login, .profile in this order. 
It will run whichever is the highest in the hierarchy, 
so, if you have .bash_profile, it will not check .profile.

优先级

.bash_profile >  .bash_login > .profile

/etc/profile 全局配置脚本

MAC 配置 JAVA_HOME

vi .bash_profile
export JAVA_HOME=xxx

source .bash_profile

echo $JAVA_HOME
 
java -verbose   
显示具体的jdk路径

.zsh_profile
export MVN_HOME=/Users/dugang/soft/mvn3
export PATH=$PATH:$MVN_HOME/bin/
source .zsh_profile


没有  .bash_profile 和  .zsh_profile  则手工创建