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Limit Crontab between a specific interval

I have a ruby ​​file, and I need to run it every 3 hours. This code works fine:

27 */3 * * * /path/to/ruby -rubygems /path/to/ruby_file.rb

And I do not want this file to work between midnight 12:00 a.m. to 8:00 a.m.

How to install it?

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4 answers

27 9-23/3 * * * should work on most modern Unix variants.

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27 9-23/3 * * * /path/to/ruby -rubygems /path/to/ruby_file.rb

gotta do the trick.

A good summary of everything can be found in this wikipedia article .

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*/15    10-20   *       *       *       /usr/bin/php /tmp/myscript.php

*/6     6-9,21-23,0-2   *       *       *       /usr/bin/php /tmp/myscript.php

cron , . : cron 23-0

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2-10/4, 2,8 2,6,10?

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