2017-10-13

bash_profile和bashrc区别

.bash_profile 与 .bashrc 的区别

.bash_profile is executed for login shells, while .bashrc is executed for interactive non-login shells.

当你直接在机器login界面登陆、使用ssh登陆或者su切换用户登陆时，.bash_profile 会被调用来初始化shell环境

Note：.bash_profile文件默认调用.bashrc文件

.bash_profile中有如下内容

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if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

当你不登陆系统而使用ssh直接在远端执行命令，.bashrc 会被调用
当你已经登陆系统后，每打开一个新的Terminal时，.bashrc 都会被再次调用。

测试准备工作

hclient2主机hadoop用户家目录下执行

1 2	[hadoop@hclient2 ~]$ echo "invoke hclient2:~/.bashrc">>.bashrc [hadoop@hclient2 ~]$ echo "invoke hclient2:~/.bash_profile">>.bash_profile

窗口登陆

Red Hat Enterprise Linux Server release 6.3 (Santiago)
Kernel 2.6.32-279.el6.x86_64 on an x86_64
hclient2 login: hadoop
Password:
Last login: Mon Feb 25 23:03:45 on tty1
invoke hclient2:~/.bashrc
invoke hclient2:~/.bash_profile
[hadoop@hclient2 ~]$

SSH 登陆

[hadoop@hserver ~]$ ssh hclient2
Last login: Mon Feb 25 22:42:19 2013 from hserver
invoke hclient2:~/.bashrc
invoke hclient2:~/.bash_profile
[hadoop@hclient2 ~]$

su 登陆

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[root@hclient2 ~]# su - hadoop
invoke hclient2:~/.bashrc
invoke hclient2:~/.bash_profile

Non-login Shell:

Note:

1	ssh ...[user@] hostname [command]

If command is specified, it is executed on the remote host instead of a login shell.
[hadoop@hserver ~]$ ssh hclient2 hostname
invoke hclient2:~/.bashrc
hclient2

注：若要配置环境变量之类，最保险是写在 .bashrc 文件中。因为不管是登陆还是不登陆，该文件总会被调用！

.bash_profile 与 .bashrc 的区别

login shell 与 non-login shell 的区别

测试准备工作

Login Shell