A process is an instance of a computer program that is being
executed.
A process is an instance of a running computer program.
Obtaining information about processes
Some useful tools
top, htop: text-mode system monitors, showing process information in real time
lsof: list process open files. Also netstat specifically for network connections.
ptrace(): a programming interface to see all the system calls that a process is making. Different systems have different command line tools: strace on Linux, ktrace on *BSD, truss on Solaris, dtrace on FreeBSD and Mac OS X, …
I'm looking for the process started in Linux which has process ID 0. I know init has PID 1 , which is the first process in Linux, is there any process with PID 0?
Today I just noticed that my process IDs are very high, in the 400,000 (i.e 449624). When I run ps -ef | more, that's when I noticed it. Is that normal or does that indicate a problem? Otherwise the scripts are running fine.
I am using Redhat 7.3…
When I use either of these commands with an argument as the name of a process, both of them return the exact same number. Are they the same commands? Are they two different commands that do the same thing? Is one of them an alias to the other?
pidof…
This laptop has an SSD and therefore I decided to omit the swap. This works well in most cases, but sometimes the RAM gets a bit short and the computer gets really sluggish and tends to freeze up. Is there a way to implement a "kill the biggest…
I have a xmms2d process running, but two possible executable files (in different directories, both in the executable path) that could have spawned it. I suspect that one of those is corrupted, because sometimes this program works and sometimes it…
Currently I'm using the following to check how long a process is actually running:
ps -eo uid,pid,etime | egrep '^ *MY_ID' | egrep 'PID_OF_PROCESS'
And that outputs the following:
MY_ID PID_OF_PROCESS 00:16
However, after the process ends I…
I'm reading "The Unix Programming Environment", but I don't comprehend the concept current directory of process.
Each process, has a current directory, and all filenames are
implicitly assumed to start with the name of that directory, unless
…
I have noticed that both browsers Firefox and Chromium on Linux do open the file /proc/self/mem for reading. No other program on my system reads this file, as far as I can tell.
/proc/self/mem is notorious for being vector for endless privilege…
After installing Linux Mint 19 I wanted to check how vsinc affects fps in Linux, so I typed this command: CLUTTER_SHOW_FPS=1 cinnamon --replace
After some time I accidentally pressed Ctrl+Z and paused that process. Immediately my Bash shell and…
What determines what PID a process will be assigned?
It seems as if there is an upper bound for the integer value that's used for the ID; what is this limit and where is it defined?
Is there a range that is reserved for processes that are not…
Possible Duplicate:
How can I close a terminal without killing the command running in it?
If I open a terminal emulator, type firefox & and then close the terminal, the process it launched -Firefox- gets killed as it was its child.
How can I…
In the output of top, the state S means interruptible sleep.
What is the state of those processes which are scheduled to be ready and waiting for execution in CPU by the scheduler? Is it S or something else?
Is there a state meaning idle? If yes,…
A long while ago I went to a job interview with a thoroughly weird company in London who claimed to be expert Unix consultants. Anyway these people were complete nutters and not surprisingly the company doesn't seem to be there any more, but at the…
