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Full Discussion: perl regex multi line cut
Top Forums Shell Programming and Scripting perl regex multi line cut Post 302434344 by durden_tyler on Friday 2nd of July 2010 07:50:46 AM
Old 07-02-2010
Quote:
Originally Posted by tip78
...
there's a file with lots of comments.. some of them looks like:

=comment
blabla
blablabla
bla
=cut

i'm trying to cut this out completely...
but no luck
...
Maybe something like this ?

Code:
$
$ cat f5
some code here
and some more code here
=comment
blabla
blah blah blah
more blah blah
=cut
some code here
some more code here
=comment
blah more blah
=cut
and more code...
$
$ perl -lne 'BEGIN{undef $/} s/^=.*?=cut//msg; print' f5
some code here
and some more code here
 
some code here
some more code here
 
and more code...
 
$
$

tyler_durden

==
Note that there's a blank line in the output for every comment block. If you don't want those either, then -

Code:
$
$
$ perl -ne 'BEGIN{undef $/} s/^=.*?=cut\n//msg; print' f5
some code here
and some more code here
some code here
some more code here
and more code...
$
$
$

for the same file "f5".

HTH,
tyler_durden
 

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CUT(1)							    BSD General Commands Manual 						    CUT(1)

NAME
cut -- select portions of each line of a file SYNOPSIS
cut -b list [-n] [file ...] cut -c list [file ...] cut -f list [-d delim] [-s] [file ...] DESCRIPTION
The cut utility selects portions of each line (as specified by list) from each file and writes them to the standard output. If the file argument is a single dash ('-') or no file arguments were specified, lines are read from the standard input. The items specified by list can be in terms of column position or in terms of fields delimited by a special character. Column numbering starts from 1. list is a comma or whitespace separated set of increasing numbers and/or number ranges. Number ranges consist of a number, a dash (-), and a second number and select the fields or columns from the first number to the second, inclusive. Numbers or number ranges may be preceded by a dash, which selects all fields or columns from 1 to the first number. Numbers or number ranges may be followed by a dash, which selects all fields or columns from the last number to the end of the line. Numbers and number ranges may be repeated, overlapping, and in any order. It is not an error to select fields or columns not present in the input line. The options are as follows: -b list The list specifies byte positions. -c list The list specifies character positions. -d string Use the first character of string as the field delimiter character. The default is the <TAB> character. -f list The list specifies fields, separated by the field delimiter character. The selected fields are output, separated by the field delimiter character. -n Do not split multi-byte characters. -s Suppresses lines with no field delimiter characters. Unless specified, lines with no delimiters are passed through unmodified. EXIT STATUS
cut exits 0 on success, 1 if an error occurred. SEE ALSO
paste(1) STANDARDS
The cut utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). BSD
December 21, 2008 BSD
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