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I want some process not to run because I don't need them. Is there a way to prevent from running some processes?

After start up if possible or by opening applications with is it "child process" (i mean under).

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If they are processes run at start-up, they can be disabled, if you really need them to be. Do you have any examples? – mfisch Nov 24 '12 at 4:21

You can stop the process from running by changing the permissions.

Look for the process and remove the execute permission.

use -x option with chmod command to remove the execute permission.

Be sure of what you are doing. Few process might depend on other process. So make sure what you stopping.

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