Card hand generator & matcher http://unix.stackexchange.com/a/211717/116972

card.sh

#!/bin/bash

# This version conforms to Bash 3.2.53 on OS X.

stab=('\e[0;31;47m ♦' '\e[0;31;47m ♥' '\e[0;30;47m ♠' '\e[0;30;47m ♣')
ntab=(2 3 4 5 6 7 8 9 10 J Q K A)

match() {
        for i; do
                printf "  ${stab[$((i/13))]}${ntab[$((i%13))]}\e[0m"
        done
        printf "\n"

        suits=(0 0 0 0)
        nums=(0 0 0 0 0 0 0 0 0 0 0 0 0)
        same2=()
        same3=()
        same4=()
        flush=-1
        straight=-1
        conseq=0
        for i; do
                ((suits[i/13]++))
                ((nums[i%13]++))
        done
        for ((i=0; i<4; i++)); do
                ((suits[i]==5)) && flush=$i
        done
        for ((i=0; i<13; i++)); do
                case ${nums[$i]} in
                2) same2+=($i) ;;
                3) same3+=($i) ;;
                4) same4+=($i) ;;
                esac
                if ((i>0)); then
                        conseq=$((nums[i]>0?(nums[i-1]>0?conseq+1:1):0))
                else
                        conseq=$((nums[i]>0?1:0))
                fi
                ((conseq==5)) && straight=$i
        done
        if ((${#same4[*]}>0)); then
                echo "FOUR OF A KIND - ${ntab[${same4[0]}]}"
        elif ((${#same3[*]}>0)); then
                if ((${#same2}>0)); then
                        echo "FULL HOUSE - ${ntab[${same3[0]}]} ${ntab[${same2[0]}]}"
                else
                        echo "THREE OF A KIND - ${ntab[${same3[0]}]}"
                fi
        elif ((${#same2[*]}>1)); then
                echo "TWO PAIR - ${ntab[${same2[1]}]} ${ntab[${same2[0]}]}"
        elif ((${#same2[*]}>0)); then
                echo "ONE PAIR - ${ntab[${same2[0]}]}"
        elif ((straight>=0)); then
                if ((flush>=0)); then
                        if ((straight==12)); then
                                echo "ROYAL FLUSH"
                        else
                                echo "STRAIGHT FLUSH"
                        fi
                else
                        echo "STRAIGHT"
                fi
        elif ((flush>=0)); then
                echo "FLUSH"
        else
                echo "NO PAIR"
        fi
}

# Tests
match 14 45 0 11 49  # NO PAIR
match 51 13 39 9 50  # ONE PAIR
match 34 21 1 11 50  # TWO PAIR
match 8 3 21 22 34   # THREE OF A KIND
match 51 24 36 9 21  # STRAIGHT
match 1 3 5 7 9      # FLUSH
match 5 18 31 15 28  # FULL HOUSE
match 10 9 22 35 48  # FOUR OF A KIND
match 1 2 3 4 5      # STRAIGHT FLUSH
match 12 11 10 9 8   # ROYAL FLUSH

# Random draw
#match $(shuf -e -n 5 {0..51})

shuf=({0..51})
cards=()
for i in 0 1 2 3 4; do
        j=$((RANDOM%${#shuf[*]}))
        cards+=(${shuf[$j]})
        unset shuf[$j]
done
match "${cards[@]}"