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Top Forums UNIX for Beginners Questions & Answers How do I use grep to grab prime number output from my factor program? Post 302985091 by Don Cragun on Friday 4th of November 2016 04:40:57 PM
Old 11-04-2016
Or, translating RudiC's awk command to a grep command that produces the same output:
Code:
factor/factor 30000000-31000000 | grep '^\([0-9]*\) = \1$'

This User Gave Thanks to Don Cragun For This Post:
 

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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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