tports

#!/usr/bin/env sh

# Help message function
print_help() {
  echo "Usage: $0 <TYPE> <NUM> <SEP>"
  echo "  TYPE: Port type to filter (e.g. udp, tcp)"
  echo "  NUM: Number of results to retrieve"
  echo "  SEP: Seperator (e.g. , or .)"
}

# Check if the number of arguments is correct
if [ "$#" -lt 2 ]; then
  echo "Error: Invalid number of arguments"
  print_help
  exit 1
fi

TYPE="$1"
NUM="$2"
SEP="$3"

# Retrieve the matching ports and process them
#out=$(grep "/$TYPE" /usr/local/opt/nmap/share/nmap/nmap-services | sort -rk3 | cut -f2 | grep -Eo '\d+' | head -n "$NUM" | tr ',' '\n' | awk '{a[i++]=$0} END {for (j=i-1; j>=0;) print a[j--] }')
out=$(grep "/$TYPE" /usr/local/opt/nmap/share/nmap/nmap-services | sort -rk3 | cut -f2 | grep -Eo '\d+' | head -n "$NUM")

# Check if the first argument is not empty
if [ -n "$3" ]; then
  out=$(printf "$out" | tr '\n' "$3")
fi

# Remove trailing comma from the output
out="${out%,}"

echo "$out"