All the shell configurations are done in /etc/profile and /etc/bash.bashrc.I have no ".profile" and ".bashrc" in mine and root's $HOME.
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6677,0,0>pthfdr@SALAMAND:~$ mkfs.fat --help
bash: mkfs.fat: command not found
6678,127,0>pthfdr@SALAMAND:~$ which mkfs.fat
6679,1,0>pthfdr@SALAMAND:~$ sudo which mkfs.fat
/sbin/mkfs.fat
6680,0,0>pthfdr@SALAMAND:~$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/games
6681,0,0>pthfdr@SALAMAND:~$ sudo echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/games
6682,0,0>pthfdr@SALAMAND:~$ su
Password:
204,0,0>root@SALAMAND:/home/pthfdr# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
205,0,0>root@SALAMAND:/home/pthfdr# cat /etc/profile|grep PATH
# SET PATH
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games"
export PATH
206,0,0>root@SALAMAND:/home/pthfdr# cat /etc/bash.bashrc|grep PATH
207,1,0>root@SALAMAND:/home/pthfdr#