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When going through one shell script, I saw the term "$?". What is the significance of this term?

What does $# mean in shell? I have code such as if [ $# -eq 0 ] then I want to understand what $# means, but Google search is very bad for searching these kinds of things.

Understanding the Context

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Linux shell Linux shell 1.

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Key Insights

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Linux ShellPythonShellLinuxLinux.

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We are to count the number of binary strings of length 7 (with letters A and S) where no two As are adjacent.
Let $ a_n $ be the number of valid sequences of length $ n $ with no two consecutive As.
Question: A civil engineer is overseeing the construction of 6 identical emergency shelters after a disaster. There are 8 types of modular units available, but due to supply constraints, exactly 6 units must be used, and each shelter must receive at least one unit. How many distinct combinations of unit types can be selected, assuming each type can be used multiple times?

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