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Full Discussion: Script not running
Top Forums UNIX for Beginners Questions & Answers Script not running Post 303009642 by bakunin on Sunday 17th of December 2017 07:31:07 PM
Old 12-17-2017
Quote:
Originally Posted by scriptor
Code:
cat alarm_log.$DATE |grep -B 1 "failure"

Amen to what rbatte1 said. Furthermore the line is a "useless use of cat", as the experts call it. This:

Code:
grep -B 1 "failure" "alarm_log.$DATE"

Does the same in less processes and with less taxing the system.

I hope this helps.

bakunin
 

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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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