http://www.fmi.uni-passau.de/archive/doc/unix/unixhelp/Unixhelp/environment_env3a.html (Einblicke ins Internet, 10/1995) Changing your environment: Bourne shell
At login the Bourne shell reads the initialisation files
/etc/profile and $HOME/.profile. You cannot change the
content of /etc/profile, but you have permission to edit
the contents of .profile, which is in your home directory
and is owned by you.