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Even now, I persist in believing that these black marks on white paper bear the greatest significance, that if I keep writing I might be able to catch the rainbow of consciousness in a jar.

Jeffrey Eugenides


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🦋 Interval

Here is a bash script to determine the interval between two date/times. Parameters are two dates, specified using any format the date utility can recognize; if the second parameter is omitted, "now" is assumed. Output is the number of seconds between the two, followed by "d h:m:s" format.

 #!/bin/bash

if [ $# -eq 0 ]
then
echo Usage: `basename $0` \ \[\\ default \"now\"\] >&2
exit -1
fi

start=`date +%s -d "$1"`
if [ $# -eq 1 ]
then
fin=`date +%s`
else
fin=`date +%s -d "$2"`
fi

res=`expr $fin - $start`
if [ $res -lt 0 ]
then
res=`expr 0 - $res`
fi

echo $res sec
d=`expr $res / 86400`
t=`expr $res % 86400`
h=`expr $t / 3600`
ms=`expr $t % 3600`
m=`expr $ms / 60`
s=`expr $ms % 60`
if [ $d -gt 0 ]
then
echo -n $d day
if [ $d -gt 1 ]
then
echo -n s
fi
echo -n \
fi
if [ $t -gt 0 ]
then
echo -n $h\:
if [ $m -lt 10 ]
then
echo -n 0
fi
echo -n $m
if [ $s -gt 0 ]
then
echo -n \:
if [ $s -lt 10 ]
then
echo -n 0
fi
echo -n $s
fi
fi
echo

posted evening of Sunday, March 11th, 2007
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