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# Interrupt Execution - ctrl+Break, Break, Command+. , and ctrl+C

You can interrupt J execution. In Jwdw you signal with ctrl+Break (key labeled as Pause/Break); in Jwdp you signal with Break or on the Mac with Command+. , and in Jconsole you signal with ctrl+C.
One signal interrupts at the start of a sentence with an attention interrupt or a request for input (for example, 1!:![1) with an input interrupt. Input interrupt is not currently supported in Jconsole in Unix.
Two or more signals breaks execution in the middle of a sentence with a break
It is much preferred to use a single signal to get an attention interrupt as the state of execution at the start of a line is clear. In a break it is not clear what has been executed and there is some chance of crash as it is difficult to ensure a clean state in all cases. Signals should be made carefully and you should wait many seconds before making additional signals.

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