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Top Forums UNIX for Dummies Questions & Answers Syslog Messages from Remote Server are not writing to Log File Anymore Post 302919044 by bakunin on Saturday 27th of September 2014 05:08:47 AM
Old 09-27-2014
Quote:
Originally Posted by mrm5102
But that's good to know. I assume you could use that for most daemons that are running?
Absolutely. Whenever you want to delete a file which might be written to by a running process instead of "rm file" use

Code:
cat /dev/null > /path/to/file

which will shorten it to 0 bytes length but retain the inode. The result is the same file with its contents removed instead of a new file with the same name as the old one.

If a program honors a signal depends on how it was written. "Well-behaving" programs (that is: ones which are written like Unix programs are meant to be written) do so, but not every programmer adheres to some informal standard. You will have to find out for every specific program yourself if it is the case or not.

I hope this helps.

bakunin
 

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PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME
pidof -- find the process ID of a running program. SYNOPSIS
pidof [-s] [-c] [-n] [-x] [-o omitpid[,omitpid..]] [-o omitpid[,omitpid..]..] program [program..] DESCRIPTION
Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead. OPTIONS
-s Single shot - this instructs the program to only return one pid. -c Only return process ids that are running with the same root directory. This option is ignored for non-root users, as they will be unable to check the current root directory of processes they do not own. -n Avoid stat(2) system function call on all binaries which are located on network based file systems like NFS. Instead of using this option the the variable PIDOF_NETFS may be set and exported. -x Scripts too - this causes the program to also return process id's of shells running the named scripts. -o omitpid Tells pidof to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro- gram, in other words the calling shell or shell script. EXIT STATUS
0 At least one program was found with the requested name. 1 No program was found with the requested name. NOTES
pidof is actually the same program as killall5; the program behaves according to the name under which it is called. When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs. Note that that the executable name of running processes is calculated with readlink(2), so symbolic links to executables will also match. SEE ALSO
shutdown(8), init(8), halt(8), reboot(8), killall5(8) AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl 01 Sep 1998 PIDOF(8)
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