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Editorial Team
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Asked: 2026-05-28T11:10:35+00:00

I want to set a cron run after an other cron. For example: Cron

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I want to set a cron run after an other cron. For example: Cron A finishs at 01:00 PM, cron B will start at 01:01 PM. The problem is I don’t know when cron A finishs.

I checked the crontab syntax. It doesn’t provide any param for that purpose.

My actual situation is:

# This cron must run first.
? ? * * * /usr/local/bin/php -f /path/select_and_print_to_log_file.php

# two these crons runs at the same time.
0 13 * * * /usr/local/bin/php -f /path/update_user.php
0 13 * * * /usr/local/bin/php -f /path/update_image.php

# This cron runs right after two above cron completes.
? ? * * * /usr/local/bin/php -f /path/select_and_print_to_log_file.php
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1 Answer

  1. Editorial Team

    Your first job could produce a timestamp when finished.

    Then you estimate – for example – that job A needs about 60 to 90 minutes. After 60 minutes, you start job B. Job b looks for the timestamp. If it is present, job B starts, else it waits for a minute and looks again.

    After finishing, job B deletes the timestamp, or renames it, maybe from ‘todo’ to ‘done’. You could insert the current date inside the file, to check, whether your estimation is still acceptable, or should be adjusted.

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