#!/usr/bin/env ksh

# simple loop examples
# this will work in both bash and kshell
buf="x"                         # seed to enter loop
while [[ -n $buf  ]]            # until they enter an empty buffer
do
    printf "enter a string or nothing to quit: "        # prompt
    read buf
    if [[ -n $buf ]]
    then
        printf "${buf//[aeiou]/}\n"                     # do something with valid input
    fi
done


# this illustrates a different technique, the prompt will only work in kshell
# the two command prompting mechanism from the previous example can 
# be substituted for portability. 
while true          # forever
do
    read buf?"enter a string or nothing to quit: "  # prompt and read user input
    if [[ -z $buf  ]]        # also (silently) support end of file
    then
        printf "\n"         # if they used ^D ensure prompt is on next line
        exit 0
    fi

    printf "${buf//[aeiou]/}\n"     # do something with user input and print
done                # loop for more