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    <p>Convert your min/max dates into "seconds since epoch",</p> <pre><code>MIN=`date --date="$1" +%s` MAX=`date --date="$2" +%s` </code></pre> <p>Convert the first <code>n</code> words in each log line to the same,</p> <pre><code>L_DATE=`echo $LINE | awk '{print $1 $2 ... $n}'` L_DATE=`date --date="$L_DATE" +%s` </code></pre> <p>Compare and throw away lines until you reach <code>MIN</code>,</p> <pre><code>if (( $MIN &gt; $L_DATE )) ; then continue ; fi </code></pre> <p>Compare and print lines until you reach <code>MAX</code>,</p> <pre><code>if (( $L_DATE &lt;= $MAX )) ; then echo $LINE ; fi </code></pre> <p>Exit when you exceed <code>MAX</code>.</p> <pre><code>if (( $L_DATE &gt; $MAX )) ; then exit 0 ; fi </code></pre> <p>The whole script <strong>minmaxlog.sh</strong> looks like this,</p> <pre><code>#!/usr/bin/env bash MIN=`date --date="$1" +%s` MAX=`date --date="$2" +%s` while true ; do read LINE if [ "$LINE" = "" ] ; then break ; fi L_DATE=`echo $LINE | awk '{print $1 " " $2 " " $3 " " $4}'` L_DATE=`date --date="$L_DATE" +%s` if (( $MIN &gt; $L_DATE )) ; then continue ; fi if (( $L_DATE &lt;= $MAX )) ; then echo $LINE ; fi if (( $L_DATE &gt; $MAX )) ; then break ; fi done </code></pre> <p>I ran it on this file <strong>minmaxlog.input</strong>,</p> <pre><code>May 5 12:23:45 2009 first line May 6 12:23:45 2009 second line May 7 12:23:45 2009 third line May 9 12:23:45 2009 fourth line June 1 12:23:45 2009 fifth line June 3 12:23:45 2009 sixth line </code></pre> <p>like this,</p> <pre><code>./minmaxlog.sh "May 6" "May 8" &lt; minmaxlog.input </code></pre>
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    1. POHow can I use bash (grep/sed/etc) to grab a section of a logfile between 2 timestamps?
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    1. USDylan
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    1. COI really don't think that bash is the way to go for efficiency, though. This is extremely simple, yes, but if you want it to be fast consider using C with lseek( ) and a binary search.
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    2. COWhy care for performance if you are only going to do it once or twice?
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      1. USDaniel
    3. CO@Daniel, where was it said that this was only going to be done once or twice?
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