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bashAssociative Array Group And Count
#!/usr/bin/env bash
set -euo pipefail

declare -A counts

while read -r line; do
  ((counts["$line"]++))
done < input.txt

for key in "${!counts[@]}"; do
  printf "%s\t%d\n" "$key" "${counts[$key]}"
done | sort -t$'\t' -k2 -rn

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