6.5 PATH and path

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 setenv PATH ( 6.4 ) , the C shell modifies path accordingly. For example:

setenv PATH /bin:/usr/bin:/usr/local::$HOME/bin

In PATH , an empty entry ( :: ) stands for the current directory. The C shell's path shell variable ( 6.8 , 6.9 ) is the actual search list. Its syntax is slightly different; the list of directories is enclosed in parentheses ( 47.5 ) , and the directories are separated by spaces. For example:

~
 

set path=(/bin /usr/bin /usr/local . ~/bin)

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 .