Shell Programming and Scripting

               AB   CDE   FG
 1   
2   
3
4
5
6
7

printFlightSeats()
{

rows=7
columns=7
for ((i=0;i<=$rows;i++))
do
    echo -n "$i" | tr "0" " "
    for ((j=0;j<$columns;j++))
    do  
    echo -n "$j" | tr "0" " " | tr "1234567" "ABCDEFG"
        
    done
    printf $j
    printf "$i\n"
done

}

     AB CDE FG
1
2
3
4
5
6
7

nrows=${1:-7}


for col in "  " A B "  " C D E "  " F G    # print header row
do
       printf "%s" "$col"
done
printf "\n"

for $(( row=1; row < $nrows; row++ ))    # print rows
do
    printf "%s\n" "$row"
 done

nrows=${1:-7}
ncols=${2:-7}
typeset -a layout
case $ncols in
    2) layout=(A " "  B );;
    3) layout=(A "  " C D);;
    4) layout=(A B "  " C D);;
    6) layout=(A B C "  " D E F);;
    7) layout=(A B " "  C D E " "  F G);
     9) layout=(A B "  " C D E F G "  " H I);;
    *)  echo "invalid layout size entered"
        exit 1
        ;;
esac

for row in " " $( seq 1  $nrows )
do
    printf "%s  " "$row"
    for (( col=0; $col < ${#layout[@]}; col++ ))
    do
        printf "%s" "${layout[$col]}"
    done
    printf "\n"
done
exit

>>>show_seats 6 7
   AB CDE FG
1  AB CDE FG
2  AB CDE FG
3  AB CDE FG
4  AB CDE FG
5  AB CDE FG
6  AB CDE FG

nrows=${1:-7}

typeset -a layout
case $ncols in
    2) layout=(A " "  B );;
    3) layout=(A "  " C D);;
    4) layout=(A B "  " C D);;
    6) layout=(A B C "  " D E F);;
    7) layout=(A B " "  C D E " "  F G);;
    8) layout=(A B "  " C D E F G "  " H I);;
    *)  echo "invalid layout size entered"
        exit 1
        ;;
esac