util/bin/randline


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#! /bin/sh
#
# choose a line randomly.
#
set -euf

lines="`cat`"
count=`echo "$lines" | wc -l`
random=`od -An -t u8 -N 8 /dev/urandom`
choice=`echo "$random % $count + 1" | bc`

echo "$lines" | sed -n "${choice}p"