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Top Forums Shell Programming and Scripting Filter uniq field values (non-substring) Post 302900604 by vgersh99 on Wednesday 7th of May 2014 06:08:20 PM
Old 05-07-2014
Quote:
Originally Posted by alister
That approach only tests potential substrings against some of the strings which precede it. As a consequence, the first string in the file is always included.

Consider the result if the first line in the OP's data sample were deleted.

Regards,
Alister
very good point - thank you!
here's a diff approach:
Code:
awk '{for(i in a) if ($2 ~ i) delete a[i];a[$2]=$0}END {for (i in a) print a[i]}' myFile

 

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DIFFPP(1)							      DIFFPP								 DIFFPP(1)

NAME
diffpp - pretty-print diff outputs with GNU enscript SYNOPSIS
diffpp currentfile < diff-file DESCRIPTION
Diffpp converts diff(1)-program's output files to a format suitable to be printed with GNU enscript(1). Program annotates the changes with enscript's special escapes so enscript can highlight the modified portions of the file. All changed and added lines are printed with gray-background, deleted lines are marked with minus (`-') characters; diffpp prints one minus character for each deleted line. EXAMPLES
The easiest way to use diffpp is to use it as an input filter for enscript. If an input filter is specified for enscript it is used to pre-process the incoming data-stream. Filtering does not alter any header strings or file-timestamps which might be printed on enscript headers; only the incoming data is modified. enscript -G2re --filter='rcsdiff %s | diffpp %s' *.c *.h Print the changes between current source files and their latest RCS-versions. enscript -G2re --filter='diff %s~ %s | diffpp %s' *.c *.h Print changes between source files and the corresponding backup-files. SEE ALSO
diff(1), enscript(1) AUTHOR
Markku Rossi <mtr@iki.fi> <http://www.iki.fi/~mtr/> DIFFPP
Jan 29, 1997 DIFFPP(1)
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