From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Dog Walker" <forestiero@qwest.net>
Subject: Adding to the PATH but not if already in $PATH
Date: Sat, 26 Feb 2005 10:16:27 -0800
Message-ID: <200502261016.28122.forestiero@qwest.net>
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To: linux-newbie@vger.kernel.org

I want to prepend a directory to my PATH in my $HOME/.bashrc and export the 
result. But I only want it to happen once: iow, if a directory I want 
prepended is already in the PATH, do not prepend it again.

Something like:

   if "/home/dw/bin" not in $PATH ; then
   PATH=/home/dw:$PATH
   export PATH
   fi

The questions are: Is this the way one guards against multiple additions in 
subshells? Is there a way to check for a substring?

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