Ways to 'kill' With Linux
To kill or not to kill
kill is most often used without an argument or with -9, to kill a process off. But it can also be used to send various other signals to a process. Some are variations on process termination, but you can also get information about or out of processes.
- kill -0 pid: This doesn't actually kill the process, just
returns 0 (success) if the process exists and 1 (failure) if not. The
command itself will not give you any output — you have to look at the
exit code, using echo $? to get the information. So as
kill -0 1685; echo $?will output 0 if process 1685 exists, and 1 if it doesn't. This can also be useful in shell scripts if you have a process number recorded and wish to check if it's still running.
- kill -9 pid: You probably already know that you can terminate the process WITH EXTREME PREJUDICE. kill -KILL does the same thing and has the advantage of looking more vicious. The downside is that it is an extra couple of characters to type.
- kill -HUP pid: Restarts the process.
- kill -INT pid: Another way of killing the process, this time by interrupting it. It is a useful halfway house between kill and kill -9.
- kill -ABRT pid: Stops your program and gets it to dump core if possible/appropriate. (kill -6 is a synonym.) This can be useful if a process is misbehaving, as it means that you may get debug information.
Solid state disks (SSDs) made a splash in consumer technology, and now the technology has its eyes on the enterprise storage market. Download this eBook to see what SSDs can do for your infrastructure and review the pros and cons of this potentially game-changing storage technology.
- 1Linux Top 3: GNOME 3.12 and New Betas for Ubuntu 14.04 and OpenMandriva Lx 2014.0
- 2Linux Top 3: Linus Lashes out, Linux 3.14 Gets PIE and Ubuntu One is Done.
- 3Linux Top 3: Ubuntu 14.04, Debian Gives Squeeze More Life and Red Hat Goes Atomic
- 4Linux Top 3: RHEL 6.5, Debian 7.2 and EOL for Linux 3.0.x
- 5Linux Top 3: CoreOS, Oracle Enterprise Linux 7 and Ubuntu 14.10