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Top Forums Shell Programming and Scripting Using perl to grep a list of patterns from an input file Post 302761671 by gimley on Saturday 26th of January 2013 11:45:35 PM
Old 01-27-2013
Many thanks for the explanation.
The size of the pattern file has increased but awk seems to respond pretty well. To speed up the process, I converted all Unicode to 8 bit and got a fair amount of speed in computation.
Thanks a lot.

---------- Post updated at 11:45 PM ---------- Previous update was at 11:13 AM ----------

Sorry to hassle again. I got the logic, but I have two queries:
A simple one:suppose I wanted to print all the data found on one line instead of on separate lines, what would I have to tweak ? I tried tweaking the print command but could not get the script to print all words on one line.
More complex. My pattern file has gone huge. I am testing 4 letter combos which means around 64000 strings to match. When I run the file against around a similar size of inputs, the script executes but does not give the expected result.
Any solutions. I am quite desperate to solve this issue. Many thanks in advance but with my limited knowledge of AWK and the reading I am doing from OReilley's book on sed and awk, things do not seem to work out.
 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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