PS(1) General Commands Manual PS(1)NAME
ps - process status
SYNOPSIS
ps [-alxU] [kernel mm fs]
OPTIONS -a Print all processes with controlling terminals
-l Give long listing
-x Include processes without a terminal
EXAMPLES
ps -axl # Print all processes and tasks in long format
DESCRIPTION
Ps prints the status of active processes. Normally only the caller's own processes are listed in short format (the PID, TTY, TIME and CMD
fields as explained below). The long listing contains:
F Kernel flags: 001: free slot 002: no memory map 004: sending; 010: receiving 020:
inform on pending signals 040: pending signals 100: being traced.
S State: R: runnable W: waiting (on a message) S: sleeping (i.e.,suspended on MM or FS) Z:
zombie T: stopped
UID, PID, PPID, PGRP The user, process, parent process and process group ID's.
SZ Size of the process in kilobytes.
RECV Process/task on which a receiving process is waiting or sleeping.
TTY Controlling tty for the process.
TIME Process' cumulative (user + system) execution time.
CMD Command line arguments of the process.
The files /dev/{mem,kmem} are used to read the system tables and command line arguments from. Terminal names in /dev are used to generate
the mnemonic names in the TTY column, so ps is independent of terminal naming conventions.
PS(1)
Check Out this Related Man Page
TTY(4) Linux Programmer's Manual TTY(4)NAME
tty - controlling terminal
DESCRIPTION
The file /dev/tty is a character file with major number 5 and minor number 0, usually of mode 0666 and owner.group root.tty. It is a syn-
onym for the controlling terminal of a process, if any.
In addition to the ioctl(2) requests supported by the device that tty refers to, the ioctl(2) request TIOCNOTTY is supported.
TIOCNOTTY
Detach the calling process from its controlling terminal.
If the process is the session leader, then SIGHUP and SIGCONT signals are sent to the foreground process group and all processes in the
current session lose their controlling tty.
This ioctl(2) call works only on file descriptors connected to /dev/tty. It is used by daemon processes when they are invoked by a user at
a terminal. The process attempts to open /dev/tty. If the open succeeds, it detaches itself from the terminal by using TIOCNOTTY, while
if the open fails, it is obviously not attached to a terminal and does not need to detach itself.
FILES
/dev/tty
SEE ALSO chown(1), mknod(1), ioctl(2), termios(3), console(4), tty_ioctl(4), ttyS(4), agetty(8), mingetty(8)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2003-04-07 TTY(4)
Is there any way I can get UNIX to return the Process ID of a process when I actually issue the command to invoke the process?
For example, if I was to launch an emacs process in batch mode, by issuing the UNIX command :
% emacs file.txt&
then UNIX would return the Process ID (PID).... (7 Replies)
I have successfully opened /dev/table/proc file and read processes pids and its details from it, but I am unable to have programatic knowledge of how to access process CMD or its corresponding name.
Kindly do guide me out on the said request for which I will be very thankfull. (3 Replies)
Can someone tell me the meaning of the column 'C' contained in the output of the ps -ef command?
UID PID PPID C STIME TTY TIME COMMAND
I was once told that if the value was higher then 0 and the process showed to be in a state of sleep when running a top then the command had... (6 Replies)
Hi,
Q1-What does
nroff -ms > /dev/null
Q2- What does mean -A under STAT column :
ps aux |head -20
UTIL PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND
root 516 93,0 0,0 12 12 - A 04 nov 3906:51 wait
Thank you. (4 Replies)
Hi All,
In my project i have two process runs in the back end.
Once i start my project, and execute the command ps, i get below output:
PID TTY TIME CMD
9086 pts/1 0:00 ksh
9241 pts/1 0:02 java
9240 pts/1 0:00 shell_script_bg
java with 9241 PID is the main... (4 Replies)
Hi,
Could someone please tell me how to wakeup sleeping processes? (i.e. change the process status from "S" to "R" when viewing in ps command).
I ran a few programs in the background by "&" which went into "sleep" mode and I want them to run.
Any help will be greatly appreciated.
Steve (11 Replies)
When I typed in ps -a I get this:
PID TTY TIME CMD
31799 pts/3 00:00:00 vim
31866 pts/3 00:00:00 vim
And to check who is currently logged in, I type who
Felix Whoals
Tada Whoals
Lala Whoals
How can I get the user process for all current users who logged in?? I think I need to combine... (14 Replies)
hi
I m trying to display the processes of each user but its coming in one line like
george wilkins
PID TTY TIME CMD 7661 ? 00:00:01 sshd 7662 pts/6 00:00:00 bash
i want the output to be like
PID TTY TIME CMD
7661 ? 00:00:01 sshd
7662 pts/6 00:00:00 bash
my code is
proc=$(users)... (5 Replies)
Hi, I'm trying to learn csh so I've started to do some simple scrips.
Now I'm kinda stuck in this one: I want to do a script that first search, for each user, if there's at least a process with a TIME >= something (30 mins, for example).
There are 2 things that I cant figure out:
- in the... (3 Replies)
Hi guys,
Any easy way to generate a CSV file that contains only the numbers out of the following lines?
load averages: 15.09, 12.89, 11.76 03:39:22
999 processes: 854 sleeping, 2 running, 122 zombie, 5 stopped, 16 on cpu
Memory: 32G real, 17G free, 18G swap in use, 15G swap free
... (6 Replies)
hi all
sleeping processes in the following output , are they doing anything , but consuming lot of sources, should I need to kill them , how to know , , what they are doing
and the output says out of 260 processes only 9 are running , and 251 are sleeping , what does the sleeping means, can... (8 Replies)