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#!/bin/sh
letters()
{
grepped=$(echo "$1" | grep -E "^[a-zA-Z]+$")
[ "$1" = "$grepped" ] && return 0 || return 1
}
empty()
{
if echo "$1" | grep -qE '^[[:space:]]+$'; then
return 0
fi
return 1
}
digit()
{
grepped=$(echo "$1" | grep -E "^[0-9]$")
[ "$1" = "$grepped" ] && return 0 || return 1
}
number()
{
grepped=$(echo "$1" | grep -E "^[1-9][0-9]+$")
[ "$1" = "$grepped" ] && return 0 || return 1
}
alph()
{
grepped=$(echo "$1" | grep -E "^[a-zA-Z0-9]+$")
[ "$1" = "$grepped" ] && return 0 || return 1
}
while IFS='' read -r str; do
if [ -z "$str" ]; then
echo it is empty
continue
elif letters "$str"; then
echo "it is a word"
elif number "$str"; then
echo "it is a number"
elif digit "$str"; then
echo "it is a digit"
elif empty "$str"; then
echo "it is empty"
elif alph "$str"; then
echo "it is an alphanum"
else
echo "it is too complicated"
exit
fi
done
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