PATH for root in bash?

[Hans Ginzel <hans zavinac kolej bod mff bod cuni bod cz>]

        Dobry den,

   kde vsude se nastavuje cesta (promenna PATH) pri prihlasovani
uzivatele/superuzivatele?

   Otazka mne trapi po nasledujicim experimentu.

login: root
password:
bash# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11
bash# ls ~/.bash_profile
bash# ls: /root/.bash_profile: No such file or directory
bash# vi ESC.           ; # vi ~/.bash_profile
i
echo $PATH
[ -d ~/bin ] && export PATH=~/bin:"$PATH"
ESC:wq
bash# exit
login: root
password:
/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games
bash# echo $PATH
~/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games

   Proc je cesta ruzna od prvniho pipadu? Cteni jakeho jineho souboru
se zabranilo existencí ~/.bash_profile? Souboru /etc/profile? Ale ten
standardne obsahuje

        PATH="/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games"
        export PATH

   Muze neexpandovana tilda (~) zpusobit nejake obtize?
Jak to, ze pri takovemhle nastaveni obsahovala cesta v prvnim pripade
/usr/sbin? Nacital tehdy bash /etc/profile?
Pro uplnost dodavam, ze /etc/bash.bashrc ani ~/.bashrc nic s PATH
nedelaji.

   Jak je to souborem /etc/environment. Pouziva ho prave program
login/rlogin nebo jeste nekdo jiny? Experimentalne jsem overil, ze
        su - user
nenastavi promenne v nem uvedene. To je neprijemne, protoze pak
prostredi login: user a su - user nejsou ekvivalentni.
Je ciste rozsirit su o ten kus kodu z login.c,
ktery zpracovava /etc/environment?

        Zdravi
                                        Hans Ginzel


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