read_key_test.sh

#!/bin/bash

# pastebin https://pastebin.com/7r8C8S5S

# docs:
# https://unix.stackexchange.com/questions/111508/bash-test-if-word-is-in-set
# https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash

echo
echo -n "Potwierdzasz?(T/n): "
read answ


# commit=1
# # zawieranie się znaków w zbiorze alternatywa dla łańcucha warunków w instrukcji 'if'
# case $answ in
#     T|t) ;;
#     *)   commit=0;;
# esac
#
# echo "commit: $commit"

# inny sposób:
# if [[ "$answ" =~ ^(t|T)$  ]]; then
#     echo "Potwierdzenie"
# else
#     echo "Rezygnacja"
# fi

# lub jeszcze inny sposób
# https://unix.stackexchange.com/questions/111508/bash-test-if-word-is-in-set
# read answ
# for w in t T
# do
#   if [ "$w" == "$answ" ]
#   then
#       yes=1
#       break
#   fi
# done;
# [ "$yes" == "1" ] && echo "$answ is in the list" ||
#                      echo "$answ is not in the list"

# użytkownik nacisnął [ENTER] czyli w domyśle potwierdza 'T' albo 't'
if test -z "$answ"; then
    echo "Pusty znak w domyśle Potwierdzenie..."
    answ="T"
fi
# https://stackoverflow.com/questions/3826425/how-to-represent-multiple-conditions-in-a-shell-if-statement

if [[ ("$answ" = "T" || "$answ" = "t") ]]; then
# if test $answ = "T" || test $answ = "t"; then
    echo "Potwierdzenie"
else
    echo "Rezygnacja"
fi

echo "Podano: $answ"