pause gdb without breakpoint

When I am debugging a program in Xcode, I can pause execution in there debugger console. Is there any way to do this using gdb from the command line?

I'd like to do this so I can modify breakpoints after t开发者_StackOverflow中文版he program has started.

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You can just press Ctrl+C and will be able to do what you ask, although it might not always work (see comments below).