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In page Bash (Unix shell):

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Processes can "catch" and "handle" IPC signals they receive. A user can use the kill builtin to "send" an IPC signal to another process. That target process can set up a mechanism, some plan beforehand, for how to repsond whenever any particular signal might be received, or "caught." The way a target program responds is referred to as how the program "handles" receiving the signal. In the man pages one can see how some system commands will print out certain information to the terminal when they receive a SIGHUP: for example, the dd command.[citation needed]