Learn Bash Scripting by Building Five Programs - Build Five Programs

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Challenge: Learn Bash Scripting by Building Five Programs - Build Five Programs

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i am building a countdown.sh timer, if i input the correct thing, the checker doesnt check. what do i do?

if [[ $1 -gt 0 ]]
then
echo true
else
echo Include a positive integer as the first argument.
fi

the checker refused to tick