Using CRON jobs to visit url?

问题:

I have a web application that has to perform a repeated tasks, Sending messages and alerts, I, already, use a script page do those tasks when it loaded in the browser i.e http://example.com/tasks.php and I included it by the mean of iframe in every page of my web application.

Now I want to change this to use CRON jobs because the first approach may leads to jam performance, So How could I make a CRON job that visits http://example.com/tasks.php. However, I don't want this CRON job creating output files such as day.*!

I host the application on shared hosting service that permits CRON jobs via cPanel.

回答1:

* * * * * wget -O - http://yoursite.com/tasks.php >/dev/null 2>&1

That should work for you. Just have a wget script that loads the page.

Using -O - means that the output of the web request will be sent to STDOUT (standard output)

by adding >/dev/null we instruct standard output to be redirect to a black hole. by adding 2>&1 we instruct STDERR (errors) to also be sent to STDOUT, and thus all output will be sent to a blackhole. (so it will load the website, but never write a file anywhere)

回答2:

You don't need the redirection, use only

* * * * * wget -qO /dev/null http://yoursite.com/tasks.php

回答3:

You can use curl as is in this thread

For the lazy:

*/5 * * * * curl --request GET 'http://exemple.com/path/check.php?param1=1'

This will be executed every 5 minutes.

回答4:

You can also use the local commandline php-cli:

* * * * * php /local/root/path/to/tasks.php > /dev/null

It is faster and decrease load for your webserver.

回答5:

i use this commands

wget -q -O /dev/null "http://example.com/some/cron/job.php" > /dev/null 2>&1

Cron task:

* * * * * wget -q -O /dev/null "http://example.com/some/cron/job.php" > /dev/null 2>&1

回答6:

you can use this for url with parameters:

lynx -dump "http://vps-managed.com/tasks.php?code=23456"

lynx is available on all systems by default.

回答7:

You can use this command:

links https://www.honeymovies.com

回答8:

U can try this :-

    wget -q -O - http://www.example.com/ >/dev/null 2>&1

回答9:

* * * * * wget --quiet https://example.com/file --output-document=/dev/null

I find --quiet clearer than -q, and --output-document=/dev/null clearer than -O - > /dev/null