7.2.3.2. The profile.d directory

for i in /etc/profile.d/*.sh ; do
    if [ -r $i ]; then
        . $i
    fi
done
unset i

All readable shell scripts from the /etc/profile.d directory are read and executed. These do things like enabling color-ls, aliasing vi to vim, setting locales etc. The temporary variable i is unset to prevent it from disturbing shell behavior later on.