Question

1

Repetitive Tasks with bash scripting

rated 0 times [ 1] [ 0] / answers: 1 / hits: 1332 / 3 Years ago, thu, august 5, 2021, 6:03:38

I have a php console app and an Ubuntu server. I'm executing the app with this basic command:

php app.php

I want to execute it repetitively, but cronjobs is not suitable for me. Instead, I want it to execute such that when app.php finishes working it will be executed again immediately (like an infinity loop), rather than being executed again every X minutes.
So I made this bash script:

while true; do

php app.php

done

this solves my problem, but the usage of while true seems evil. Is it possible to stop this bash script, if necessary? Or can you tell me a better way to do this?

(app.php file , fetches a long list of website URLs and their content. It's like a web spider. I connect to the server via ssh , execute bash script with nohup, and then close terminal. )

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rvousnove

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3 Years ago

answered 3 Years ago otatorm · Accepted Answer

Here is an example about what you can do:

#!/bin/bash



while true; do

    if [ -t 0 ]; then stty -echo -icanon time 0 min 0; fi



    keypress=''

    while [ "x$keypress" = "x" ]; do

        #do something... in your case:

        php app.php

        #end of 'do something'



        read keypress

    done



    if [ -t 0 ]; then stty sane; fi



    echo "You pressed '$keypress' for pause."

    read -p 'Press [Enter] key to continue or [Ctrl+C] to finish...'

done

To pause you can press any key without Enter. To continue you must to press Enter. To finish you must to press Ctrl+C.

If you run the script in background using:

nohup <name_of_script> &

you can stop it using the following commands:

ps -ef | grep <name_of_script> #to find the pid of the running script

kill -9 <pid_of_your_running_script>