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Full Discussion: Display all the words whose length is equal to the longest word in the text
Top Forums UNIX for Dummies Questions & Answers Display all the words whose length is equal to the longest word in the text Post 302547119 by yazu on Sunday 14th of August 2011 05:55:23 AM
Old 08-14-2011
It's impossible to do with pipes - you need read all lines to find out the maximum length and then print saved lines which matches the maximum. Awk is a good tool for it - you read lines, save those with the current maximum and after processing you print all lines with the real maximum:
Code:
tr -s " .,;" "\n" <random.txt | awk 'length($0) >= max { a[$0]++; max = length($0) }
END {
  for (s in a) if (length(s) == max) print s
}'

Or a little better:
Code:
... awk '                                          
length($0)  > max { a[$0]++; max = length($0) }
length($0) == max { a[$0]++ }
END {                                       
  for (s in a) if (length(s) == max) print s
}'

Last edited by yazu; 08-14-2011 at 07:07 AM.. Reason: Corrected a bug and added a better version
 

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LEARN ABOUT DEBIAN

sql::reservedwords::postgresql

SQL::ReservedWords::PostgreSQL(3pm)			User Contributed Perl Documentation		       SQL::ReservedWords::PostgreSQL(3pm)

NAME

       SQL::ReservedWords::PostgreSQL - Reserved SQL words by PostgreSQL

SYNOPSIS

	  if ( SQL::ReservedWords::PostgreSQL->is_reserved( $word ) ) {
	      print "$word is a reserved PostgreSQL word!";
	  }

DESCRIPTION

       Determine if words are reserved by PostgreSQL.

METHODS

       is_reserved( $word )
	   Returns a boolean indicating if $word is reserved by either PostgreSQL 7.3, 7.4, 8.0 or 8.1.

       is_reserved_by_postgresql7( $word )
	   Returns a boolean indicating if $word is reserved by either PostgreSQL 7.3 or 7.4.

       is_reserved_by_postgresql8( $word )
	   Returns a boolean indicating if $word is reserved by either PostgreSQL 8.0 or 8.1.

       reserved_by( $word )
	   Returns a list with PostgreSQL versions that reserves $word.

       words
	   Returns a list with all reserved words.

EXPORTS

       Nothing by default. Following subroutines can be exported:

       is_reserved
       is_reserved_by_postgresql7
       is_reserved_by_postgresql8
       reserved_by
       words

SEE ALSO

       SQL::ReservedWords

       <http://www.postgresql.org/docs/manuals/>

AUTHOR

       Christian Hansen "chansen@cpan.org"

COPYRIGHT

       This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.8.8							    2008-03-28				       SQL::ReservedWords::PostgreSQL(3pm)
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