I am stuck and don’t know what is wrong. How to get more hints and move forward.
Are you sure it should be 50 there? 
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5 doesnt get me past this either.
Can you copy/paste your latest code attempt for this step?
You are not typing the command as stated into the terminal. You have a typo. The following are the only arithmetic operator:
-eq, -ne, -lt, -le, -gt, or -ge
In this step also only that part should be entered in terminal, without the ./countdown.sh
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./countdown.sh [[ 4 -le 5 ]].
OMG ! Thanks so much both of you!
[[ 4 -le 5 ]]
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