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CommentStreams:00b554afb04e06bb3bd69db79163cfcb

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More legible:

testpulse1=$(date +%s%N | cut -b1-13) && echo $testpulse1

testpulse2=$(date +%s%N | cut -b1-13) && echo $testpulse2

pulsegap=$(($testpulse2-$testpulse1)) && echo $pulsegap

Warmly yours.