Shell Programming and Scripting

while true
do
    echo "Would you like to:"
    echo "1) See your name"
    echo "2) See your current directory"
    echo "3) See your home directory"
    echo "4) Quit"
    echo -n ">> "
    read case

    case "$case" in
        1) echo "username";;
        2) echo "$PWD";;
        3) echo "$HOME";;
        4) break;;
    esac
done

echo "Quit"

myfunc 1 2 3 4

myfunc 1 2 4

Would you like to:
1) See your name
2) See your current directory
3) See your home directory
4) Quit
>> 1

#! /usr/bin/ksh
set -a arr
set -a sort_case
while true
do
    echo "SELECT THE OPTION:"
    echo "1) CASE1"
    echo "2) CASE2"
    echo "3) CASE3"
    echo "4) Quit"
    echo -n ">> "
read  case
typeset -i case
arr[${i}]=$case
echo -e "Array All - ${arr[*]}\n"
case "$case" in
        1) echo "CASE_1";;
        2) echo "CASE_2";;
        3) echo "CASE_3";;
        *) break;;
    esac
i=`expr $i + 1`
done
echo "Quit"

#!/bin/ksh
# Initialize variables
d1=0
d2=0
d3=0
err=0
while [ 1 ]
do      if [ $d3 = 0 ]
        then    list="3, 4"
        else    list="4"
        fi
        if [ $d2 = 0 ]
        then    list="2, $list"
        fi
        if [ $d1 = 0 ]
        then    list="1, $list"
        fi
        printf "Choose an unused selection (%s): " "$list"
        read choice
        case "$choice" in
        (1)     if [ $d1 = 1 ]
                then    printf "Choice 1 is invalid.\n" >&2
                        err=$((err + 1))
                        continue
                fi
                d1=1
                echo 'Choice 1 has been processed.';;
        (2)     if [ $d2 = 1 ]
                then    printf "Choice 2 is invalid.\n" >&2
                        err=$((err + 1))
                        continue
                fi
                d2=1
                echo 'Choice 2 has been processed.';;
        (3)     if [ $d3 = 1 ]
                then    printf "Choice 3 is invalid.\n" >&2
                        err=$((err + 1))
                        continue
                fi
                d3=1
                echo 'Choice 3 has been processed.';;
        (4)     echo 'Choice 4 has been processed.'
                break;;
        esac
done
printf "%d error(s) reported.\n" $err
if [ $d1 -eq 0 ]
then    echo '#1 was not selected'
fi
if [ $d2 -eq 0 ]
then    echo '#2 was not selected'
fi
if [ $d3 -eq 0 ]
then    echo '#3 was not selected'
fi