On Fri, 12 May 2006, Giorgos Keramidas wrote:
There are at least the following ways:
sed -i -e 's/^[[:space:]]*' -e 's/[[:space:]]*$//' file ...
perl -pi -e 's/^\s*(\S.*\S)[ \t]*$/$1/' file ...
The first one seems more straightforward to me most of the time,
but there are times I find Perl's `-pi -e ...' idiom very convenient.
Neither of those work here:
The first sed expression is missing "//". Correcting that:
sed -i -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' test.txt
sed: lstat: No such file or directory
The Perl version shows no difference between the original and processed
file. It's complex, too. This one works:
perl -pi -le 's/^\s+//; s/\s+$//' test.txt
1. sed always seems to be a pain. My compliments to those who use it
regularly; the only time I use it at all is when Perl (or something
else with better handling of regular expressions) is not available.
2. The -l option to perl is needed to preserve line endings.
3. The last version is based on the more efficient way of doing it as
per: man -P 'less +/trim' perlop
-Warren Block * Rapid City, South Dakota USA
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