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Full Discussion: Unexpected Results (at least I did not expect them)
Top Forums Shell Programming and Scripting Unexpected Results (at least I did not expect them) Post 302206409 by era on Tuesday 17th of June 2008 04:12:03 PM
Old 06-17-2008
The simplest workaround would be to use fgrep instead of grep if your search criteria are always static strings. If you are lucky enough to have one which supports the -f option, you also don't need the loop at all.

Code:
fgrep -f SearchCriteria $SearchFiles >>$SEARCHDIR/search.output 2>>$SEARCHDIR/search.error

If you want to neutralize any regex specials in the search string, try something like

Code:
grep `echo "$SearchCriteria" | sed -e 's/[][\\.*$^]/\\&/g'` $SearchFiles

Your attempt at using sed for this was not doing anything useful, I'm afraid. The above should hopefully work better, although it's completely off the top of my head (so I probably forgot a few of the regex specials) and different versions of sed use slightly different regex syntax (so yours probably has a slightly different set of special characters than mine).

The main misunderstanding was how to pass something to sed; it expects a file name (not a string to use as input) as an argument, or reads standard input; and simply prints any output, so to use the output in your script, you have to capture it with backquotes or something.

Just to top it off, here is a slightly more elegant and efficient way to code the loop:

Code:
sed -e 's/[][\\.*$^]/\\&/g' SearchCriteria |
while read regex; do
  grep "$regex" $SearchFiles
done >>output 2>>error

Last edited by era; 06-17-2008 at 05:28 PM.. Reason: Note on fgrep -f patternfile; better sed loop
 

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LEARN ABOUT DEBIAN

varnishsizes

VARNISHSIZES(1) 														   VARNISHSIZES(1)

NAME

       varnishsizes - Varnish object size request histogram

SYNOPSIS

       varnishsizes [-b] [-C] [-c] [-d] [-I regex] [-i tag] [-m tag:regex ...]

	      [-n varnish_name] [-r file] [-V] [-w delay] [-X regex] [-x tag]

DESCRIPTION

       The varnishsizes utility reads varnishd(1) shared memory logs and presents a continuously updated histogram showing the distribution of the
       last N requests by their processing.  The value of N and the vertical scale are displayed in the top left corner.  The horizontal scale	is
       a logarithmic representation of bytes.  Hits are marked with a pipe character ("|"), and misses are marked with a hash character ("#").

       The following options are available:

       -b     Include  log entries which result from communication with a backend server.  If neither -b nor -c is specified, varnishsizes acts as
	      if they both were.

       -C     Ignore case when matching regular expressions.

       -c     Include log entries which result from communication with a client.  If neither -b nor -c is specified, varnishsizes acts as if  they
	      both were.

       -d     Process old log entries on startup.  Normally, varnishsizes will only process entries which are written to the log after it starts.

       -I regex
	      Include log entries which match the specified regular expression.  If neither -I nor -i is specified, all log entries are included.

       -i tag Include log entries with the specified tag.  If neither -I nor -i is specified, all log entries are included.

       -m tag:regex only list record where tag matches regex. Multiple -m

	      options are AND-ed together.

       -n     Specifies the name of the varnishd instance to get logs from.  If -n is not specified, the host name is used.

       -r file
	      Read log entries from file instead of shared memory.

       -V     Display the version number and exit.

       -w delay
	      Wait  at least delay seconds between each update.  The default is 1.  file instead of displaying them.  The file will be overwritten
	      unless the -a option was specified.

       -X regex
	      Exclude log entries which match the specified regular expression.

       -x tag Exclude log entries with the specified tag.

SEE ALSO

       o varnishd(1)

       o varnishlog(1)

       o varnishncsa(1)

       o varnishstat(1)

       o varnishtop(1)

HISTORY

       The varnishsizes utility was developed by Kristian Lyngstol based on varnishhist.  This manual  page  was  written  by  Kristian  Lyngstol,
       Dag-Erling Smorgrav and Per Buer.

COPYRIGHT

       This document is licensed under the same licence as Varnish itself. See LICENCE for details.

       o Copyright (c) 2010 Varnish Software AS

AUTHOR

       Dag Erling Smorgrav, Kristian Lyngstol, Per Buer

1.0								    2010-05-31							   VARNISHSIZES(1)
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