linux-shell/1 – FMI Tasks/Test 2 Preparation/28 (B) extract last digit.sh at master · andy489/linux-shell

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#!/bin/bash

# 28.sh B) extract last digit

temp=$(mktemp)

data=$(mktemp)

cat | egrep "^[-+]?[0-9]+$" | sort -n > "${temp}"

[ "$(cat "$temp" | wc -l )" -ne 0 ] || { echo -n "\nno valid numbers"; exit 1; }

while read NUM; do

SUM=0

NUM_COPY="$NUM"

NUM="$( echo $NUM | sed -E "s/-//" )"

while [ "$NUM" -ne 0 ]; do

REM=$(expr $NUM % 10 )

SUM=$( expr $SUM + $REM )

NUM=$( expr $NUM / 10 )

done

echo "${NUM_COPY} ${SUM}" >> "${data}"

done < <(cat "${temp}")

uniq -c "${data}" | awk '{$1=$1}1' | grep '^1' | cut -d' ' -f2,3 > "${temp}"

#cat "${temp}"

largest_sum_digits_and_unique=$(cat "${temp}" | sort -t' ' -k2 | tail -1 | cut -d' ' -f2)

RES=$(cat "${temp}" | grep "${largest_sum_digits_and_unique}$" | sort -t' ' -k1 | tail -1 | cut -d' ' -f1)

echo -e "\n${RES}"

rm -- "${temp}"

rm -- "${data}"

exit 0