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#!/bin/bash
in=$1
column=$2
out=$3
map=$(mktemp /tmp/libnss.XXXXXX)
strings -at d "$in" > "$map"
: > "$out"
exec 2>/dev/null
for value in $(tr -s [:blank:] ! < "$map" | cut -f3 -d! | cut -f"$column" -d: | LC_COLLATE=C sort) ; do
offset=$(grep "$value" "$map" | tr -s [:blank:] ! | cut -f2 -d!)
printf "%s\0%d\0" "$value" "$offset" >> "$out"
len=$(printf "%s\0%d\0" "$value" "$offset" | wc -c)
for _i in $(seq 1 $((16-len))) ; do
printf "\0" >> "$out"
done
printf "\n" >> "$out"
done
rm "$map"
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