I have a php script that perform some actions after killing some old processes.
act.php
$pids = shell_exec('ps aux | grep "saso" | awk \'{print $2}\'');
$pids = str_replace("\n", ' ', $pids);
$pids = array_filter(explode(' ', $pids));
foreach ($pids as $pid) {
shell_exec('kill -9 ' . $pid . ' > /dev/null 2>&1 &');
}
// reset of the code . ..
The script works well by running php act.php. It fetch process ids, kill it, then run the rest.
But it is not working when I run nohup php act.php & or nohup php act.php. The process is not killed.
I need nohup to run the script in the background with no hang up.
Can't PHP script fetch pids behind nohup ? and are there any alternatives ?
Thanks in advance.
If you search properly, you can find the result.
Try:
$output = shell_exec('/usr/bin/nohup php script.php >/dev/null 2>&1 &');
Or:
exec('/usr/bin/nohup php script.php >/dev/null 2>&1 &');
Related
I've been at this for a few days now on and off while working on other sections of my project
echo "playing";
header("HTTP/1.1 200 OK");
exec('./omx-start.sh "' . $full . '" > /dev/null 2>&1 &');
die();
I've also put the exec in my die like:
die(exec('nohup ./omx-start.sh "' . $full . '" > /dev/null 2>&1 &'));
I've also tried adding nohup (like above)
content of omx-start.sh
ps cax | grep "omxplayer" > /dev/null
if [ $? -eq 0 ]; then
sudo killall omxplayer && sudo killall omxplayer.bin
fi
echo $1
if [ -e "playing" ]
then
rm "playing"
fi
mkfifo "playing"
nohup omxplayer -b -o hdmi "$1" > /dev/null 2>&1 &
also I've added nohup and & at by the control operator
it SHOULD fork off into subshell
I can do this easily with python, with any other language actually.
I am almost going to have to make my php script call a python script that runs the omx-start.sh script too? or is there actually a good way to fork php scripts or force them to stop loading?
My die(); SOMETIMES triggers as well if I do die("test"); I can see it, sometimes triggering. and the page STILL is hanging (loading) but the php process is freed up to take other request at that time.. but the page.. still.. hangs.. what?
I have a long running PHP script that i want to be executed in background on server after a user action. and the user should be redirected to other page while command should be running in background.
Below is the code
$command = exec('php -q /mylongrunningscript.php');
header("Location: /main.php?action=welcome");
The above script is running fine, but page does not redirected until $command = exec('php -q /mylongrunningscript.php'); is executed.
I want that user should be immediately redirected to the welcome page.
Is there any other way to achieve this task.
The other idea is that that $command = exec('php -q /mylongrunningscript.php'); should be executed on welcome page, but welcome page HTML is shown after the command has executed. command takes about 5,6 minutes and this time page does not redirects.
I am On Cent os Linux with PHP 5.3
Can you try this instead:
$result = shell_exec('php -q /mylongrunningscript.php > /dev/null 2>&1 &');
PS: Note that this is redirecting stdout and stderr to /dev/null If you want to capture output then use:
$result = shell_exec('php -q /mylongrunningscript.php > /tmp/script.our 2>&1 &');
Alternatively use this PHP function to run any Unix command in background:
//Run linux command in background and return the PID created by the OS
function run_in_background($Command, $Priority = 0) {
if($Priority)
$PID = shell_exec("nohup nice -n $Priority $Command > /dev/null & echo $!");
else
$PID = shell_exec("nohup $Command > /dev/null & echo $!");
return($PID);
}
Courtesy: A comment posted on http://php.net/manual/en/function.shell-exec.php
As noted in the exec() manual page of PHP:
If a program is started with this function, in order for it to
continue running in the background, the output of the program must be
redirected to a file or another output stream. Failing to do so will
cause PHP to hang until the execution of the program ends.
So let's do that, using 2>&1 (basically 2 is stderr and 1 is stdout, so what this means is "redirect all stderr messages to stdout"):
shell_exec('php -q /mylongrunningscript.php 2>&1');
or if you want to know what it outputs:
shell_exec('php -q /mylongrunningscript.php 2>&1 > output.log');
Send the script output to /dev/null and the exec function will return immediately
$command = exec('php -q /mylongrunningscript.php > /dev/null 2>&1');
I think there are tons of similar posts but I haven't yet found a solution after searching around.
Basically, I'm trying to run two scripts in the background. When I run them in the commandline, I see after calling my first script:
/usr/bin/nohup php script.php > nohupoutput.log & echo $!
I've tried ...script.php > /dev/null & with the same result. I get:
/usr/bin/nohup: ignoring input and redirecting stderr to stdout
which I ignore and run the second one. I noticed that it seemed to be hanging there, and pressing Enter brought me back to machine:~folder>
/usr/bin/nohup php script2.php > nohupoutput.log & echo $!
Both scripts work. I tried to then convert this to a shell_exec command and nothing seems to work. I suspect that the ignoring input bit is causing difficulties, but I'm not sure. Regardless, the following does not work. It just hangs in the browser:
$output = shell_exec('/usr/bin/nohup php script.php > /dev/null &');
$output = shell_exec('/usr/bin/nohup php script2.php > /dev/null &');
Try:
$output = shell_exec('/usr/bin/nohup php script.php >/dev/null 2>&1 &');
Or:
exec('/usr/bin/nohup php script.php >/dev/null 2>&1 &');
This shoul work:
shell_exec('nohup /usr/bin/php path/to/script.php > output.txt &');
<?php
function execInBackground($cmd) {
if (substr(php_uname(), 0, 7) == "Windows"){
pclose(popen("start /B ". $cmd, "r"));
}
else {
exec($cmd . " > /dev/null &");
}
}
// take note: to get your PHP_PATH, try looking at your phpinfo :)
echo execInBackground("/usr/local/php53/bin/php 'example2.php'");
?>
First put your php command in a shell file script, e.g. myscript.sh:
#!/bin/bash
# myscript.sh file
php script.php
Run nohup with myscript.sh:
sudo nohup ./myscript.sh &
Verify with ps:
ps aux | grep myscript.sh
I have a QNAP box, that runs a flavor of linux and I am having problems getting the PID of a process using a php script. What I have so far:
$command = "PATH=$PATH:/share/MD0_DATA/.qpkg/Optware/bin: nohup /opt/bin/plowdown -o /share/MD0_DATA/Qdownload/plowshare http://www.megaupload.com/?d=m7duotr1 2> /share/MD0_DATA/Qdownload/plowshare/outputeeds.txt > /dev/null &";
exec($command, $out);
$result = $out[0];
echo $result;
If I run the command through PUTTY, I get:
[~] # nohup /opt/bin/plowdown -o /share/MD0_DATA/Qdownload/plowshare http://www.megaupload.com/?d=m7duotr1 2> /share/MD0_DATA/Qdownload/plowshare/outputteeds.txt > /dev/null &
22526
What am I doing wrong?
Thanks,
Cristian.
The shell does not normally print the PID of a process it starts in background, unless it's interactive. Otherwise, you would get tons of output during bootup just from the PIDs of all the processes that get started.
So you need to make the shell print the PID. Do
exec("(PATH=$PATH:/share/MD0_DATA/.qpkg/Optware/bin: " .
"nohup /opt/bin/plowdown -o /share/MD0_DATA/Qdownload/plowshare " .
"http://www.megaupload.com/?d=m7duotr1 2> " .
"/share/MD0_DATA/Qdownload/plowshare/outputeeds.txt > /dev/null &);" .
"echo $$;", $out);
http://nl2.php.net/manual/en/function.getmypid.php
I have a command I want to run, but I do not want PHP to sit and wait for the result.
<?php
echo "Starting Script";
exec('run_baby_run');
echo "Thanks, Script is running in background";
?>
Is it possible to have PHP not wait for the result.. i.e. just kick it off and move along to the next command.
I cant find anything, and not sure its even possible. The best I could find was someone making a CRON job to start in a minute.
From the documentation:
In order to execute a command and have it not hang your PHP script while
it runs, the program you run must not output back to PHP. To do this,
redirect both stdout and stderr to /dev/null, then background it.
> /dev/null 2>&1 &
In order to execute a command and have
it spawned off as another process that
is not dependent on the Apache thread
to keep running (will not die if
somebody cancels the page) run this:
exec('bash -c "exec nohup setsid your_command > /dev/null 2>&1 &"');
You can run the command in the background by adding a & at the end of it as:
exec('run_baby_run &');
But doing this alone will hang your script because:
If a program is started with exec function, in order for it to continue running in the background, the output of the program must be redirected to a file or another output stream. Failing to do so will cause PHP to hang until the execution of the program ends.
So you can redirect the stdout of the command to a file, if you want to see it later or to /dev/null if you want to discard it as:
exec('run_baby_run > /dev/null &');
This uses wget to notify a URL of something without waiting.
$command = 'wget -qO- http://test.com/data=data';
exec('nohup ' . $command . ' >> /dev/null 2>&1 & echo $!', $pid);
This uses ls to update a log without waiting.
$command = 'ls -la > content.log';
exec('nohup ' . $command . ' >> /dev/null 2>&1 & echo $!', $pid);
I know this question has been answered but the answers i found here didn't work for my scenario ( or for Windows ).
I am using windows 10 laptop with PHP 7.2 in Xampp v3.2.4.
$command = 'php Cron.php send_email "'. $id .'"';
if ( substr(php_uname(), 0, 7) == "Windows" )
{
//windows
pclose(popen("start /B " . $command . " 1> temp/update_log 2>&1 &", "r"));
}
else
{
//linux
shell_exec( $command . " > /dev/null 2>&1 &" );
}
This worked perfectly for me.
I hope it will help someone with windows. Cheers.
There are two possible ways to implement it.
The easiest way is direct result to dev/null
exec("run_baby_run > /dev/null 2>&1 &");
But in case you have any other operations to be performed you may consider ignore_user_abort
In this case the script will be running even after you close connection.
"exec nohup setsid your_command"
the nohup allows your_command to continue even though the process that launched may terminate first. If it does, the the SIGNUP signal will be sent to your_command causing it to terminate (unless it catches that signal and ignores it).
On Windows, you may use the COM object:
if(class_exists('COM')) {
$shell = new COM('WScript.Shell');
$shell->Run($cmd, 1, false);
}
else {
exec('nohup ' . $cmd . ' 2>&1 &');
}