Using perl to grep a list of patterns from an input file
I have been struggling to grep a file of NGrams (basically clusters of consonants or Consonant and Vowel) acting as a pattern file from an Input file which contains a long list of words, one word per line. The script would do two things:
Firstly read a text pattern from a large file of such patterns: they are all consonant clusters and grep them from the input file which will have one word per line. It would be great if the script could also identify the clusters whether they occur in the beginning, middle or end of the file. But that would be the icing on the cake.
Secondly the output should be sorted on the clusters found. In case a given cluster is not found, it whould be marked as such.
An example would help:
The pattern file is
The input file would be
The desired out put would look like:
Is it possible to write a Perl code to do something of the sort?
I have used grep and egrep with the tag to grep from a pattern file, but the data is so huge that the utilities do not give satisfactory results.
Many thanks in advance
Hi
I have 3 patterns for example to be searched.
These three patterns are available in file1.
The patterns to be searched are in file2.
I want to search the pattern of file1 to file2.
Can any one help with example?
Regards
Dhana (1 Reply)
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the Inbox
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Command: $ grep -f pattern_file.txt input_file.txt
Output: doc-C2-16354
Even the following command yields the same output:
Command: $ grep -Ff pattern_file.txt... (6 Replies)
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pattern_file: *Info in the () is not part of the pattern file. They are the intended name to replace the whole line after the pattern... (5 Replies)
Discussion started by: wxboo
5 Replies
LEARN ABOUT NETBSD
zfgrep
ZGREP(1) BSD General Commands Manual ZGREP(1)NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files
SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...]
zegrep [grep-flags] [--] pattern [file ...]
zfgrep [grep-flags] [--] pattern [file ...]
DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1).
The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern
argument.
zegrep calls egrep(1), while zfgrep calls fgrep(1).
EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0.
SEE ALSO egrep(1), fgrep(1), grep(1), gzip(1), zcat(1)AUTHORS
Thomas Klausner <wiz@NetBSD.org>
BSD December 28, 2003 BSD