Hi All,
I am trying to write a script to list all users and their processes. I cant seem to find out how to link the PID to the user. For example if i run ps -a I get a nice list of all the processes running and their PID, but no information about which user is running them.
If i use w i... (17 Replies)
Hi guys,
I'm writing a script to display all the current logged on users and the processes they're running, output to a file. The output will look similar to this:
User1 (Real name not login name)
PID TTY TIME CMD
3179 pts/3 00:00:00 vim
User2
PID TTY TIME ... (2 Replies)
I am trying to write a script to list all users and their processes. I cant seem to find out how to link the PID to the user. For example if i run ps -a I get a nice list of all the processes running and their PID, but no information about which user is running them. I need the users real name not... (3 Replies)
Thx for all the help so far, I really appreciate it, this is the last task I have to do then I am no longer a trainee ^^, which means I can use whatever utility I want. :O
I need to write a script that does more or less what is shown below.
The Users Name
PID TTY TIME CMD
12345 pts/3... (22 Replies)
hello All,
i am trying to get the each users by with thier processing. I have try it in several ways but i am not getting thier my code is
#!bin/bash/
users=`cat /etc/passwd | cut -d':' -f5`
onlineusers=`users | tr '.' ' '`
$onlineusers | while read `$users`
do
echo `ps -U $users`... (12 Replies)
I want to avoid a situation where because two users simultaneously
open a file and modify and save, leaving the original file in mess.
Is there a way in UNIX to warn a user if that particular file is already being
used by another user.
Thanks in advance (3 Replies)
Hi, I was wondering if somebody could help me as I am struggling with writing a script for a training course.
Ive had to write 5 scripts and this is the last one but am struggling with this even though I understand what it is meant to do.....
PROBLEM: write a script which will allow you to... (1 Reply)
I would like to get an opinion for my solution for this task and get feedback about better approach or mistakes I have made.
1. The problem statement, all variables and given/known data:
The task is to create a script which prints information about users whose names are specified in the... (2 Replies)
Hi,
Is it possible to display processes which have been running for more than a 5hrs using a variation of the ps -ef command?
Regards,
Manny (5 Replies)
Discussion started by: mantas44
5 Replies
LEARN ABOUT REDHAT
fifo
FIFO(4) Linux Programmer's Manual FIFO(4)NAME
fifo - first-in first-out special file, named pipe
DESCRIPTION
A FIFO special file (a named pipe) is similar to a pipe, except that it is accessed as part of the file system. It can be opened by multi-
ple processes for reading or writing. When processes are exchanging data via the FIFO, the kernel passes all data internally without writ-
ing it to the file system. Thus, the FIFO special file has no contents on the file system, the file system entry merely serves as a refer-
ence point so that processes can access the pipe using a name in the file system.
The kernel maintains exactly one pipe object for each FIFO special file that is opened by at least one process. The FIFO must be opened on
both ends (reading and writing) before data can be passed. Normally, opening the FIFO blocks until the other end is opened also.
A process can open a FIFO in non-blocking mode. In this case, opening for read only will succeed even if noone has opened on the write side
yet; opening for write only will fail with ENXIO (no such device or address) unless the other end has already been opened.
Under Linux, opening a FIFO for read and write will succeed both in blocking and non-blocking mode. POSIX leaves this behaviour undefined.
This can be used to open a FIFO for writing while there are no readers available. A process that uses both ends of the connection in order
to communicate with itself should be very careful to avoid deadlocks.
NOTES
When a process tries to write to a FIFO that is not opened for read on the other side, the process is sent a SIGPIPE signal.
FIFO special files can be created by mkfifo(3), and are specially indicated in ls -l.
SEE ALSO mkfifo(3), mkfifo(1), pipe(2), socketpair(2), open(2), signal(2), sigaction(2)Linux Man Page 1999-06-20 FIFO(4)