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Top Forums UNIX for Beginners Questions & Answers Fetching address and user details from log file Post 303018100 by RudiC on Tuesday 29th of May 2018 07:44:05 AM
Old 05-29-2018
Double checking man zgrep I see it will accept and grep straight text as well - so this is not in error. But by supplying the input file again to the second zgrep as an argument, you lose the results of the first one, because the pipe pipes into nirvana.
Please be aware that
- neither search pattern will produce a match (there's no "US" in front of "Tax", but TWO spaces).
- egrepping "line(1|2)" would match two lines IF above had found a match, but egrepping "city" will drop both lines.
So - there are several reasons it "was not giving any results".
 

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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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