Hi,
I am trying to write a script, which queries a db to get the names of processes, stores it in a file and then checks if that process is running on a remote server. However I am not getting it right, could anyone help me out.
#!/bin/sh
echo "select Address from Device where Cust =... (5 Replies)
I have a requirement to check how long a process is running on unix system.If i use ps -ef i am getting the following message
guest 2453638 1998920 0 16:16:05 - 0:00 dsapi_slave 9 8 0
but this is showing only time not the date.Can any one please advice me any script to find out how... (2 Replies)
I searched the forums but didn't see anything related to what I'm looking for. I need a script that would give me a listing of jobs running longer than, for example, 12 hours or so. Thanks in advance for your assistance!! (2 Replies)
Hi All, Need an urgent help, I have a requirement to find long running unix processes.. I have tried the below commands, but not succeed. I need to arrange the unix processess in an order of elapsed time (high to low) that runs in a system.
For Eg:
Consider we have 3 processes,
Pid 1
pid 2... (5 Replies)
The end result that I'd like is to terminate any process on my ps -u username list that extends beyond 20 minutes. I know for a fact that this process will be named l.exe, but I don't know the number in between and I won't know the PID. Is there a way to use grep or pidof to do this task every 20... (2 Replies)
I want to write a shellscript which determines if a particular process is long running than my specified threshold time.
Eg:
My process name is "prsd" and is expected to run for 15 mins and completes. If I set a threshold limit of 1 hour,
and how we can the get output of the long running... (4 Replies)
I want to check how many processes are running with same names and get their respective counts.
ps -ef|grep -Eo 'process1|process2|process3| '|sort -u | awk '{print $2": "$1}'
Output would look like :
$ ps -ef|grep -Eo 'process1|process2|process3| '|sort | uniq -c | awk '{print $2":... (8 Replies)
Hello Guys,
I need some help to find out if processes are running on remote server or not. I could do 'ssh' to do that but due to some security reasons, I need to avoid the ssh & get result from remote server.
Could you please suggest some that can be done without ssh or similar sort of... (8 Replies)
Discussion started by: UnknownGuy
8 Replies
LEARN ABOUT CENTOS
ipc::open2
IPC::Open2(3pm) Perl Programmers Reference Guide IPC::Open2(3pm)NAME
IPC::Open2 - open a process for both reading and writing using open2()
SYNOPSIS
use IPC::Open2;
$pid = open2(*CHLD_OUT, *CHLD_IN, 'some cmd and args');
# or without using the shell
$pid = open2(*CHLD_OUT, *CHLD_IN, 'some', 'cmd', 'and', 'args');
# or with handle autovivification
my($chld_out, $chld_in);
$pid = open2($chld_out, $chld_in, 'some cmd and args');
# or without using the shell
$pid = open2($chld_out, $chld_in, 'some', 'cmd', 'and', 'args');
waitpid( $pid, 0 );
my $child_exit_status = $? >> 8;
DESCRIPTION
The open2() function runs the given $cmd and connects $chld_out for reading and $chld_in for writing. It's what you think should work when
you try
$pid = open(HANDLE, "|cmd args|");
The write filehandle will have autoflush turned on.
If $chld_out is a string (that is, a bareword filehandle rather than a glob or a reference) and it begins with ">&", then the child will
send output directly to that file handle. If $chld_in is a string that begins with "<&", then $chld_in will be closed in the parent, and
the child will read from it directly. In both cases, there will be a dup(2) instead of a pipe(2) made.
If either reader or writer is the null string, this will be replaced by an autogenerated filehandle. If so, you must pass a valid lvalue
in the parameter slot so it can be overwritten in the caller, or an exception will be raised.
open2() returns the process ID of the child process. It doesn't return on failure: it just raises an exception matching "/^open2:/".
However, "exec" failures in the child are not detected. You'll have to trap SIGPIPE yourself.
open2() does not wait for and reap the child process after it exits. Except for short programs where it's acceptable to let the operating
system take care of this, you need to do this yourself. This is normally as simple as calling "waitpid $pid, 0" when you're done with the
process. Failing to do this can result in an accumulation of defunct or "zombie" processes. See "waitpid" in perlfunc for more
information.
This whole affair is quite dangerous, as you may block forever. It assumes it's going to talk to something like bc, both writing to it and
reading from it. This is presumably safe because you "know" that commands like bc will read a line at a time and output a line at a time.
Programs like sort that read their entire input stream first, however, are quite apt to cause deadlock.
The big problem with this approach is that if you don't have control over source code being run in the child process, you can't control
what it does with pipe buffering. Thus you can't just open a pipe to "cat -v" and continually read and write a line from it.
The IO::Pty and Expect modules from CPAN can help with this, as they provide a real tty (well, a pseudo-tty, actually), which gets you back
to line buffering in the invoked command again.
WARNING
The order of arguments differs from that of open3().
SEE ALSO
See IPC::Open3 for an alternative that handles STDERR as well. This function is really just a wrapper around open3().
perl v5.16.3 2013-03-04 IPC::Open2(3pm)