From owner-freebsd-questions  Fri Dec 17  1:52:47 1999
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Date: Fri, 17 Dec 1999 10:52:43 +0100 (CET)
From: Oliver Fromme <olli@dorifer.heim3.tu-clausthal.de>
Message-Id: <199912170952.KAA14689@dorifer.heim3.tu-clausthal.de>
To: dl@tyfon.net
Subject: Re: Followup: howto tokenize string in sh
Cc: freebsd-questions@freebsd.org
Organization: Administration TU Clausthal
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Dan Larsson wrote in list.freebsd-questions:
 > I know a echo "path../../is/relative" | awk -F/ '{print $n}' prints one token but I don't
 > know how to evaluate all with ".." and return true if ".." is found in a token.

If you just want to know if a variable in sh contains the
substring "..", this is easy:

   case "$var" in
           *..*)   echo 'I contain ".."!'
                   ;;
           *)      echo 'I do not contain "..".'
                   ;;
   esac

That solution is even quite efficient, because it does not
require to exec any external programs ("case" is an sh-
builtin).

However, it will also catch things like "/bla/foo..bar/baz"
which is probably not what you want.  The following is more
accurate:

   case "$var" in
           ../*|*/..|..|*/../*) echo 'Bingo!'
                                ;;
           *)                   echo 'Nope.'
                                ;;
   esac

This solution will find any path that contains ".." as a
component.  HTH.

Regards
   Oliver Fromme

-- 
Oliver Fromme, Leibnizstr. 18/61, 38678 Clausthal, Germany
(Info: finger userinfo:olli@dorifer.heim3.tu-clausthal.de)

"In jedem Stück Kohle wartet ein Diamant auf seine Geburt"
                                         (Terry Pratchett)


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