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Re: remove paths


From: Tim Mooney
Subject: Re: remove paths
Date: 20 Jul 2001 20:27:03 GMT

In article <address@hidden>, Padraig Brady <address@hidden> wrote:
> ?
> newpath=`echo $PATH | tr : '\n' | uniq | tr '\n' :`

Nice trick, but to work sorrectly, uniq must have sorted output.  That
means that you would need either sort before uniq or just a `sort -u'
in there.

The problem is, that's going to re-arrange your PATH, which is not
a good thing.

It's too bad there wasn't a way to make sed delete the *last* occurrence
of a regex on a line, rather than the default behavior of deleting the first
(absent the `g' option).  It would be relatively trivial to do it that way,
if sed could easily do this.  Of course, now that I think about it, because
regexes are greedy you could get rid of the last occurrence of a component
fairly easily.  Handling path components that happen more than twice in
the PATH would require multiple runs, though, so Paul's solution is probably
still better.

Tim
-- 
Tim Mooney                              address@hidden
Information Technology Services         (701) 231-1076 (Voice)
Room 242-J6, IACC Building              (701) 231-8541 (Fax)
North Dakota State University, Fargo, ND 58105-5164



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