ps is a command for printing information about running processes

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How to sort ps output to find processes realtime priority and identify processess currently occupied running queue

How to properly identify real-time processes currently occupied CPU queue and count them using ps? I know there is a bunch of fileds like prio,rtprio,pri,nice but do not know correct to use. It seems ...
3
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2answers
59 views

Hide arguments of commands in ps

I run an application on a linux server, and when I run the application I supply the password as a command line, like this: ./myapplication --smtp-password mypassword In our application, we didn't ...
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2answers
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ps: full command is too long

Good day! I use 'ps' to see command that starts process. The issue is that command is too long and 'ps' does not show it entirely. Example: I use command 'ps -p 2755 | less' and have following ...
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0answers
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Why total swaps and page faults/reclaims is empty in ps?

I'm running the following command: sudo ps -axo nswap,majflt,minflt,command | sort -nr | head which suppose to print total swaps in/out, total page faults and reclaims. But for given >400 ...
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1answer
36 views

difference between args in ps command

I'm new to bash and Linux and have a question. My problem is that I want to print a process name by its pid. I've googled and found few ways to do it: ps -p <PID> -o cmd ps -p <PID> -o ...
3
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2answers
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Solaris ps aux comand specific output. Why for grep need use ww parameter?

I'm starting to use Oracle Solaris 11.2 SPARC. In Linux, I can write ps aux | grep *some_data* But doesn't show any result on Solaris. Instead I need to say ps auxww | grep *some_data* I had ...
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6answers
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How to find the PID of nginx process

I am trying to fix a problem with nginx and think that there is an nginx process running on my machine. When I run this command I get this output. $ ps aux -P | grep nginx 1000 3947 0.0 0.0 ...
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3answers
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How to kill multiple processes

to find the PID of the process to kill use : pgrep <process command> I then use the kill command to kill the PID returned by pgrep <process command> kill <PID> Can these ...
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3answers
197 views

Check for process and kill if running

I am trying to find if a process is running or not, and if it is runing then I want to call a script or print something. I tried with the below few ways, but it gives me syntax error or command not ...
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4answers
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Function of second grep in `ps | grep -v | grep`

ps aux | grep firefox Lists all processes having the string "firefox" ps aux | grep -v firefox Lists all the processes without the string "firefox" ps aux | grep -v grep | grep firefox ? ...
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3answers
282 views

How do I convert the output of ps(1) to JSON?

I want to convert the output of the command ps to JSON in order to process it as structured data (with jq in this particular case). How do I do that? The output looks like the following: PID TTY ...
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2answers
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ps command not working properly? [closed]

I am using a Debian Virtual Box with the Bash shell and I am trying to use the ps command with the -c switch to find an ID of a process by searching its name. This is what I write: ps -c processname ...
0
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1answer
131 views

Need script to kill python process with low CPU usage

I've created a very large and complex python program and I now know it has a serious bug that I'm having a very hard time pinning down. I'm using this code in a production environment so I need a stop-...
4
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4answers
16k views

What is the difference between ps and top command?

What is the difference between ps and top command ? I see that both can display information about running processes . Which one should be used when ?
6
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1answer
93 views

What does '?' represent under TTY

If you run ps in your terminal, you may see something like the following: What is ?? I'm ssh'ing into a Linux server, so I assume that it's just the sshd as it says under CMD, but I'm curious what ...
4
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3answers
182 views

Why does `ps -e | less` show 'less' among processes? [duplicate]

I run ps -ejH | less. The output includes ps and less as well. What is the reason? I thought it would work as follows: First, ps will run and it will list all processes existing at that moment. ...
1
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2answers
62 views

How to determine which script is being executed by bash?

How would I determine which script is being executed by a process? When I use: ps -u user I get the following output: 10005194 26932 0.0 0.0 112700 1544 ? Ss Jun03 0:00 -bash ...
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9answers
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Show top five CPU consuming processes with `ps`

How to show top five CPU consuming processes with ps?
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0answers
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WCHAN = 0 for a sleeping task?

I am a little confused about the status of a process I have. It looks like this: $ ps -eal | head -n 1 ; ps -eal | grep perf F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 4 S ...
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2answers
90 views

Kill shell script process by name

I have a script running in background like this: nohup /tmp/a.sh & If the script is running for more than 5 mins, I want to kill it. -bash-3.2$ nohup /tmp/a.sh & [1] 2518 -bash-3.2$ nohup: ...
0
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2answers
258 views

Creating an automated idle process kill script

I would like to implement a solution to a specific instance of the generic problem wherein idle users tie up resources. I know the user list can be retrieved with w, the associated PID with ps, and ...
2
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3answers
71 views

How to count the number of instances of a certain process by canonical path (with arguments)?

Title might be a bit confusing, let me clarify.. Let's say I run the following commands: sleep 500 /bin/sleep 500 sleep 30 What I'm interested is, how to count the number of instances of the sleep ...
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3answers
46 views

Do not produce output when process does not exist

I would be happy if the following command produced no output if tail was not running: ps --no-headers $(pidof tail) Instead I get: 964 pts/2 00:00:01 bash 4393 pts/2 00:00:00 ps
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1answer
28 views

Is it possible to add description to qemu VMs?

Is it possible to add description to qemu virtual machines? I mean something similar to qemu -enable-kvm -description "RHEL test-host" .... This would allow one to easily identify virtualized hosts in ...
0
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2answers
4k views

`ps | grep | kill` aborts my script prematurely [duplicate]

I have a Linux computer that I remotely SSH into using plink on a Windows XP machine. I have a Plink program set to execute commands in a script using automated login: plink -ssh [domain name] -l [...
2
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1answer
55 views

Highlight nth column of ps output

I'm trying to find the best way to highlight a specific column of some output. Specifically, I'm trying to highlight the 9th column (which is %cpu of the command: ps -eo pid,ppid,time,user,tty,%cpu,%...
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0answers
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How to get the executed command of a process which has completed successfully using the PID?

I have small script, abc.ksh that takes 3 parameter e.g abc.ksh ${a} ${b} ${c} I will read from a config file with 'n' no of entires and I will execute abc.ksh 'n' times in parallel using a for loop. ...
4
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3answers
8k views

Why is apache2 showing up a defunct in the process list?

When I run top I see one line that doesn't look too good: 2475 www-data 20 0 0 0 0 Z 1 0.0 0:00.19 apache2 <defunct> Why is this process <defunct> and what should I ...
3
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1answer
57 views

How to make the Ubuntu Linux 16.10 System Monitor % CPU utilization agree with ps or top for a Firefox process on quad core CPU?

I would like to make the Ubuntu Linux 16.10 System Monitor % CPU utilization measurement basically agree with the ps "pcpu", % CPU utilization for an individual Firefox browser process running on a ...
0
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1answer
42 views

Discrepancy between Ubuntu 16.10 System Monitor % CPU and ps pcpu, % CPU utilization with respect to the individual Firefox browser process

What is the reason for the following discrepancy between Ubuntu Linux 16.10 System Monitor % CPU utilization and ps pcpu, % CPU utilization with respect to the individual Firefox browser process? For ...
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1answer
81 views

Difference between ps process httpd and deamon process httpd

When I'm running command ps aux | grep httpd , it shows that httpd is in running state, but on running systemctl status httpd - its inactive and disabled. Why is it so?
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2answers
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Process Scheduling Information Extraction

I want to extract the process having highest utilization on each processor core and then output its information (PID etc.) to a file. How can I do it by using either top or ps command? Thanks.
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1answer
7k views

What is the difference in CPU utilization between 'ps aux' and 'ps -ef'?

I use Ubuntu 12.04.1 Linux. I see a difference between %CPU and C output format of ps command for a process. It is not clearly noted in the ps man page. Man pages says: CODE HEADER ...
2
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4answers
3k views

I want to kill all processes that result from the following command

The following command will display all the PID's running for vmstat1: ps -ef | grep "vmstat 1" | awk '{ print $2 }' My question is, how do I kill them all, if there's like 20 of them at once?
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1answer
177 views

Why do I get the message set no match when I run this script?

#! /usr/bin/tcsh -f set ps_output = "`ps -u $user`" @ i = 2 echo "$ps_output" set ps_test while ( $i <= $#ps_output ) set line = ( $ps_output[$i] ) if ( $line[4] != "ps" && $...
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2answers
85 views

Grep command using contents of a heredoc

I'm creating a script to update a remote computer and I want to know if any user is using the computer before I update. I have a list of users and I created a heredoc with all of them. The command I'm ...
2
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1answer
26 views

Why do processes not fill up empty process IDs

Everybody knows that PID number 1 is systemd (or something equivalent). And every process after that takes another PID, counting up. However when there are 50 processes running (up to PID 50) and ...
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1answer
56 views

Get the process start time irrespective of NTP updates

I'm trying to record the start time of a process kicked off by an @reboot cronjob. I'm using ps -p $$ -o ltime= presently, but I've run into a catch. My machine (a Raspberry Pi) connects to the ...
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1answer
30 views

Output of ps lstart changed

I started a program and wrote the output of ps -p PID -o lstart= to a file, like so: $ long_running_command & [1] 4562 $ ps -p $! -o lstart= > start_time $ cat start_time Wed Apr 6 06:16:31 ...
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1answer
85 views

What are these processes and why can't I kill them?

(On OS X 10.11.3) I'm having a problem starting a java process that needs to listen on port 8040. Getting a BindException. So seems like somebody else is already listening on it. A quick check ...
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5answers
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How to find PID of an ongoing job in UNIX?

I executed a shell script which will call some internal applications and will take few hours. Due to some problems, I have to stop or kill that job. For this, first of all, I ran ps -u $uname to list ...
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1answer
453 views

List of running processes

There is a top command to show running processes. I would like to print sorted list of unique values in field COMMAND. There is my solution for this task $ top -b -n 1 | tail -n+8 | awk '{print $12}'...
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2answers
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How to get start time for a defunct process on AIX?

When I run the following commands on AIX: 22:root@SERVER:/root # ps -ef | head -1 UID PID PPID C STIME TTY TIME CMD 22:root@SERVER:/root # ps -ef | grep defunct | head -1 ...
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2answers
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Search for processes which are CPU consumming

I can track the process launched by the user4 with awk: ps aux | awk '$1~/user4/' And also to track what process consume more than 10% CPU: ps aux | awk '$3> 10' Hoe the question is not too ...
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5answers
771 views

How to get the tty in which bash is running?

In the second method proposed by this page, one gets the tty in which bash is being run with the command: ps ax | grep $$ | awk '{ print $2 }' I though to myself that surely this is a bit lazy, ...
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1answer
65 views

Script to ensure that only one instance of Oracle is running

I'm an Oracle DBA and need help/suggestion to understand a weird situation that came up today. One of our DBA job failing with saying 'Already its running' from Tivoli scheduler. However that is not ...
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1answer
3k views

Linux ps -elf command output, what is Process Flag meaning?

In output of ps -elf command in linux, we can recognize that process flag of 4 and 1, and process flag of 5, (sum of 1 and 4), but what is meaning of process flag 0 ? unfortunately, man does not help ...
2
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1answer
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I can't find the process sending mail?

I did something stupid and ran an awk that runs a while loop that sends an email every 10 seconds. I ran this as a background process: egrep '^[1-9]' /etc/hosts | grep -v 'localhost' | awk '{ system("...
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0answers
40 views

CPU usage according to ps and operf

I've acquired some data seemingly in conflict from two sources one would assume are reliable. In all likelihood, I'm misreading one of the sources. The server environment is: Ubuntu 14.04.2 LTS, 3.13....
132
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12answers
51k views

How can I prevent 'grep' from showing up in ps results?

When I search for some process that doesn't exist, e.g. $ ps aux | grep fnord wayne 15745 0.0 0.0 13580 928 pts/6 S+ 03:58 0:00 grep fnord Obviously I don'...