06-29-2013
The spaces are removed by the gsub just before the tolower. Then, as you say, the host= and everything before is stripped off. I'm not sure what the second sub is supposed to do as it is looking for the \) string which does not exist in the line. And, the pattern could/should be anchored at line end using the $ sign.
And yes, it will stop 20 lines after the first search pattern is found.
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LEARN ABOUT DEBIAN
qstail
QSTAIL(1) qstail man page QSTAIL(1)
NAME
qstail - Utility prints the end of a log file starting at the specified pattern.
SYNOPSIS
qstail -i <path> -p <pattern>
DESCRIPTION
qstail shows the end of a log file beginning with the line containing the specified pattern. This may be used to show all lines which has
been written after a certain event (e.g., server restart) or time stamp.
OPTIONS
-i <path>
Input file to read the data from.
-p <pattern>
Search pattern (literal string).
SEE ALSO
qsexec(1), qsfilter2(1), qsgeo(1), qsgrep(1), qslog(1), qslogger(1), qspng(1), qsrotate(1), qssign(1)
AUTHOR
Pascal Buchbinder, http://opensource.adnovum.ch/mod_qos/
mod_qos utilities 10.8 June 2012 QSTAIL(1)