For the C shell, it's slightly incorrect to say that PATH contains the search list for commands. It's a bit more complicated. The PATH environment variable is used to set the path shell variable; that is, whenever you , the C shell modifies path accordingly. For example:
setenv PATH /bin:/usr/bin:/usr/local::$HOME/bin
, an empty entry (
If you set the path shell variable, the C shell will automatically set the PATH environment variable. You don't need to set both. Many people use a set path command instead of setenv PATH .