filter-region

Send the current region through an external program. Alt-|

This command prompts for the name of a program and runs it, passing the current region to it as its standard input. It then displays any output from the program in a separate buffer. With a non-negative prefix argument, it replaces the current region with the program's output. With a negative prefix argument, it prompts for the name of a destination buffer. The command runs asynchronously except when it's used to replace the current region; see the process-echo variable to change that.

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fill-region Command Reference find-delimiter