Date: Fri, 12 May 2006 11:03:06 -0500 From: Martin McCormick <martin@dc.cis.okstate.edu> To: freebsd-questions@freebsd.org Subject: Re: Trimming Whitespace From Beginning and end of Text Lines Message-ID: <200605121603.k4CG36hn018673@dc.cis.okstate.edu>
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Chuck Swiger quotes and writes: >Giorgos Keramidas wrote: >> This fails to remove multiple occurences of the [[:space:]] class. >> >> There are at least the following ways: >> >> sed -i -e 's/^[[:space:]]*' -e 's/[[:space:]]*$//' file ... That did it! As soon as I saw the *, I knew what I was not doing. >> perl -pi -e 's/^\s*(\S.*\S)[ \t]*$/$1/' file ... >> >> The first one seems more straightforward to me most of the time, >> but there are times I find Perl's `-pi -e ...' idiom very convenient. >> >It is, and I wish to acknowledge the above are entirely valid solutions >to the problem, but... > > python -c 'import sys; print sys.stdin.read().strip()' < file... > >...has the advantage of being human readable. My old 300-baud accoustic >modem used to generate output which in hindsight looks astonishingly >close to regex character classes. :-) Wow! I'd almost forgotten some of that by-gone era. I had a 1200-baud modem that, in conjunction with the clock slips between our local telephone company and our PBX, used to march [] and various other garbage characters that did look just like regex. You just had to keep re-dialing until you finally got a connection that worked. Thanks to everyone for the help. Martin McCormick WB5AGZ Stillwater, OK Systems Engineer OSU Information Technology Department Network Operations Group
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