On Mon, Dec 22, 2008 at 08:53:36AM +0000, Matthew Seaman wrote:
> Gary Kline wrote:
> > anyway, this is one for giiorgos, or another perl wiz. i've
> > been using the perl subsitution cmd one-liner for years with
> > unfailing success. is there a way of deleting lines with perl
> > using the same idea as:
> > perl -pi.bak -e 's/OLDSTRING/NEWSTRING/g' file1 file2 fileN
> To delete lines matching a R.E. (grep -v effectively):
> perl -ni.bak -e 'm/SOMETHING/ || print;' file1 file2 fileN
I've been trying, unsuccessfully, to parse the above. What does
the "m" [in 'm/SOMETHING/' do. i thought it was 'match' ... and
another one, just FWIW: can perl's regex be set to ignore cases?
> To delete lines by number from many files -- eg. exclude lines 3 to 7:
> perl -ni.bak -e 'print unless ( 3 .. 7 ); close ARGV if eof;' \
> file1 file2 fileN
> The malarkey with 'close ARGV' is necessary because otherwise perl
> won't reset the input line number counter ($.) for each new file.
yeah, it's pretty important to reset the counter to zero since
i've got so many files.
one way to avoid that extended line would be to embed the perl
string within a /bin/shell script, :-) Scripts within scripts,
eh? lol. Oh: a final question. does the perl regex match vi's
/\<foo\> ? it seemed like this plot in /OLDSTRING/ failed last
sunday. i'm not entirely sure, tho.
> The range expression ( N .. M ) can take matching terms rather than
> line numbers, so you can also do things like:
> perl -ni.bak -e 'print unless ( m/FIRST/ .. m/SECOND/ )' \
> file1 file2 fileN
> Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
> Flat 3
> PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
> Kent, CT11 9PW
Gary Kline kl...@thought.org http://www.thought.org Public Service Unix
The 2.17a release of Jottings: http://jottings.thought.org/index.php
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