What does pressing Alt + Shift + 3 in Terminal do?
All I can see is that it prints a pound sign and jumps to the next line, but, supposedly, it does something special.
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In readline, Alt can be interpreted as
\e. On my system (and likely yours as well)
\e# is bound to
insert-comment, which according to the
bash(1) man page comments or uncomments the current command line and executes it. If you press it without typing anything then
# is executed, which has no effect since it's a comment.