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Top Forums UNIX for Beginners Questions & Answers Grep a pattern & Email from latest logs Post 303007303 by rbatte1 on Wednesday 15th of November 2017 06:22:40 AM
Old 11-15-2017
Hello vivekn,

I'm sure it is a good start at this, but what actually goes wrong? Does it fail to send mail, fail to detect the line, or something else?

If the log file is updated a lot, you are also firing up multiple sub-process for each line written to it. Could you do something more economical like:-
Code:
pattern="WRONG CRITERIA FOUND"

tail -fn0 logfile | \
 grep "$pattern" | \
  while read line
  do
      .... do something ...
  done

In bash you could maybe try the neater:-
Code:
pattern="WRONG CRITERIA FOUND"

while read line
do
   ... do something ...
done < <(tail -fn0 logilfe | grep "$pattern")

This User Gave Thanks to rbatte1 For This Post:
 

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SVK::Log::Filter::Grep(3)				User Contributed Perl Documentation				 SVK::Log::Filter::Grep(3)

SYNOPSIS
SVK::Log::Filter::Grep - search log messages for a given pattern DESCRIPTION
The Grep filter requires a single Perl pattern (regular expression) as its argument. The pattern is then applied to the svn:log property of each revision it receives. If the pattern matches, the revision is allowed to continue down the pipeline. If the pattern fails to match, the pipeline immediately skips to the next revision. The pattern is applied with the /i modifier (case insensitivity). If you want case-sensitivity or other modifications to the behavior of your pattern, you must use the "(?imsx-imsx)" extended pattern (see "perldoc perlre" for details). For example, to search for log messages that match exactly the characters "foo" you might use svk log --filter "grep (?-i)foo" However, to search for "foo" without regards for case, one might try svk log --filter "grep foo" The result of any capturing parentheses inside the pattern are not available. If demand dictates, the Grep filter could be modified to place the captured value somewhere in the stash for other filters to access. If the pattern contains a pipe character ('|'), it must be escaped by preceding it with a '' character. Otherwise, the portion of the pattern after the pipe character is interpreted as the name of a log filter. STASH
/PROPERTY MODIFICATIONS Grep leaves all properties and the stash intact. perl v5.10.0 2008-08-04 SVK::Log::Filter::Grep(3)
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