File Extension Counter

#!/usr/bin/env bash
# Count files by extension.
# Portable to Bash 3.2+ (macOS default) — no associative arrays:
# we emit one extension per line and let `sort | uniq -c` aggregate.
set -euo pipefail

files=(
	"main.go"
	"README.md"
	"lesson.md"
	"script.sh"
	"archive"
	"styles.css"
	"notes.md"
)

for file in "${files[@]}"; do
	if [[ "$file" == *.* ]]; then
		printf '%s\n' "${file##*.}"
	else
		printf 'no-extension\n'
	fi
done \
	| sort \
	| uniq -c \
	| awk '{ printf "%-12s %d\n", $2, $1 }'