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Full Discussion: Script to find duplicate pattern in a file irrespective of case
Top Forums Shell Programming and Scripting Script to find duplicate pattern in a file irrespective of case Post 302714751 by DGPickett on Friday 12th of October 2012 02:37:41 PM
Old 10-12-2012
Many tools have case insensitivity and forward reference in their regex. Regular expressions have many flavors and extensions. For instance, this sed finds such:
Code:
sed -in '
  :loop
  $d
  /\\$/{
    N
    b loop
    }
  /\(:[a-z][^:]*:\).*\1/p
 ' your_in_file

Narrative flow: sed runs in case insensitive mode and with no automatic output, I create a branch target so I can loop, if I hit EOF while collecting a \ continued line, I bail out with a delete, if there is a \ at the end of the line, read another line into the buffer and recheck eof and \ at end of line, grab \(\) each colon+letter+not-colon-however-many-times+colon and see if it occurs later \1, and if any such, print. The letter keeps me from grabbing inter-field areas like colon+\+end-of-line+spaces+colon ':\\\n *:' as a field.
Last edited by DGPickett; 10-12-2012 at 03:46 PM..
This User Gave Thanks to DGPickett For This Post:
johnjs
 

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LEARN ABOUT DEBIAN

tv_sort

TV_SORT(1p)						User Contributed Perl Documentation					       TV_SORT(1p)

NAME

       tv_sort - Sort XMLTV listings files by date, and add stop times.

SYNOPSIS

       tv_sort [--help] [--by-channel] [--output FILE] [FILE...]

DESCRIPTION

       Read XMLTV data and write out the same data sorted in date order.  Where stop times of programmes are missing, guess them from the start
       time of the next programme on the same channel. For the last programme of a channel, no stop time can be added.

       Tv_sort also performs some sanity checks such as making sure no two programmes on the same channel overlap.

       --output FILE write to FILE rather than standard output

       --by-channel sort first by channel id, then by date within each
		       channel.

       --duplicate-error If the input contains the same programme more than once,
			    consider this as an error. Default is to silently
			    ignore duplicate entries.

       The time sorting is by start time, then by stop time.  Without --by-channel, if start times and stop times are equal then two programmes
       are sorted by internal channel id.  With --by-channel, channel id is compared first and then times.

       You can think of tv_sort as converting XMLTV data into a canonical form, useful for diffing two files.

EXAMPLES

       At a typical Unix shell or Windows command prompt:

       tv_sort <in.xml >out.xml
       tv_sort in.xml --output out.xml

       These are different ways of saying the same thing.

AUTHOR

       Ed Avis, ed@membled.com

perl v5.14.2							    2006-03-02							       TV_SORT(1p)
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