This is a linux related problem. I have searched around but did not get a good explanation.
It seems to me that both file configure the setup when I log in, but is there any difference? I notice that there seems to be "some rule" in deciding what should go into two different files. For example, if I need to add a specific search path to $PATH, I should do it in ~/.bashrc. But if I decide to change some system setting, like
/sys/class/backlight
or
/sys/devices/cpu/cpu#/online
then I have to do this in /etc/rc.local, otherwise it will not work.
Is it because these configurations can not differ between users?
Thanks.
The difference is in when they are run and who they're running as when run i.e. rc.local is run on a change of run level and it runs as root. bashrc is bash specific and run on a non login shell as a particular user.
You can find a good explanation of rc.local here
The script /etc/rc.local is for use by the system administrator. It is traditionally executed after all the normal system services are started, at the end of the process of switching to a multiuser runlevel. You might use it to start a custom service, for example a server that's installed in /usr/local. Most installations don't need /etc/rc.local, it's provided for the minority of cases where it's needed.
and you can find what you need about bashrc
man bash
When an interactive shell that is not a login shell is started, bash reads and executes commands from ~/.bashrc, if that file exists. This may be inhibited by using the --norc option. The --rcfile file option will force bash to read and execute commands from file instead of ~/.bashrc.
There's more info on bashrc in this question...
https://superuser.com/questions/49289/what-is-the-bashrc-file
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