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Letting Readline Type For You

complete (TAB)
Attempt to do completion on the text before point. This is implementation defined. Generally, if you are typing a filename argument, you can do filename completion; if you are typing a command, you can do command completion, if you are typing in a symbol to GDB, you can do symbol name completion, if you are typing in a variable to Bash, you can do variable name completion...

possible-completions (M-?)
List the possible completions of the text before point.

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