? is a shell wildcard that stands for one character. There probably was a file called 11, 21, a1 b1, A1, or whatever, which was executed. If there were more files matching the pattern, the rest of them was used as parameters to the first one.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: OT: a bash shell oddity, need explanation by choroba
in thread OT: a bash shell oddity, need explanation by zentara

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