Show error message and exit if $FOO is unset (or null)
for ((i = 0 ; i < 100 ; i++)); do
echo $i
doneShow error message and exit if $FOO is unset (or null)
for ((i = 0 ; i < 100 ; i++)); do
echo $i
doneShow error message and exit if $FOO is unset (or null)
${FOO:?message}Copyright © 2021 Codeinu
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