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- shell - What does `kill -0` do? - Unix Linux Stack Exchange
kill -0 (or its more portable POSIX variant kill -s 0) goes through the motion of sending a signal, but doesn't actually send one It's a feature of the underlying C API that the shell command exposes in a straightforward way
- What does `kill -0 $pid` in a shell script do? - Stack Overflow
kill -0 $pid is used to check if a process running with $pid is alive or not But this can be tricky, as process ID can be reassigned, once a process exit and new process runs One can use killall -0 <process name> to get about a particular process is running or not
- linux - What does kill 0 do actually? - Super User
As you read in the man page, 0 is a special value that means “send the signal to all processes in the current process group” So, when you type kill 0 you send SIGTERM (which is the default signal) to all processes in the current process group Now, the real question here is: what is the current process group?
- command line - What does `kill -0` do? - Ask Ubuntu
kill -0 <pid> just gives a return value 0 if the process exists, and 1 if it doesn't
- What is the difference between kill and kill -9? - Stack Overflow
kill aka kill -TERM aka kill -15 is the safe and correct way of terminating a process It's equivalent to safely shutting down a computer kill -9 is the unsafe way of brutally murdering a process It's equivalent to pulling the power cord, and may cause data corruption
- What is the meaning of `kill -0 lt;pid gt;`? - Unix Linux Stack Exchange
I found in a script a call to kill -0 <pid> It looks like a way to check if process exists I don't know the exact meaning of kill -0 so I looked for its definition but I didn't find any information
- linux - What is the difference between kill 0 and kill . . .
A process ID of 0 refers to the process group of the process executing the kill command A negative process ID refers to the process group whose ID is the absolute value of the proc ID It's possible that the two could be different, as process groups may be changed
- What does kill 0 do actually? - Unix Linux Stack Exchange
kill 0 kills the process group of the caller Note that if you do: bin kill 0, the shell will start a new job to execute that kill command, so kill will only kill itself kill is usually a shell builtin though, so kill will kill the process group of the shell
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