Situation is - I need to change system wide variable PATH and LD_LIBRARY_PATH.

Editing file ~/.bashrc works, but only with current user in current bash sesion.

I want to create my own file rc.myrc which is run somewhere in system boot.

I have created rc.myrc and currently testing it.
Running rc.myrc does not permanently change the variables, new values are only available while rc.myrc is running. After finishing rc.myrc, previous values are in place (in the same bash session).

What am I doing wrong?
Should I better put new path for example in /etc/rc.d/rc.S ?
What else scripts set PATH, besides /etc/rc.d/rc.S? (rc.S does not contain full path as it is now)

Using Slackware.
Thank you.

/etc/profile sets PATH system wide (i.e., for every user). ~/.bashrc works for the current user whenever a new Bash shell is spawned including the initial Bash shell on login.

For normal users, you should use ~/.bash_profile and for global changes, make them in /etc/profile. If you use a distro like Red Hat, Mandriva or openSUSE, you can put global settings in an individual file which you place in the /etc/profile.d directory.