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Linux® Desk Reference, Second Edition by Scott Hawkins

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Introduction

The commands in this section are all used to tell the system to do something at (or until) a later time.

Proper use of these commands is the key to an efficiently run system. Throughout this book I have made suggestions about tasks that should be automated and run on a regular basis. These include, but are not limited to the following:

  • system security checks (passwords, file access…)

  • cleanup of temporary files (rm /tmp/*)

  • updating system databases (updatedb)

  • backups and archiving (tar, shar)

The following commands are included in this section:

at Add a job to the scheduling queue.
atq Display the contents of the scheduling queue.
atrm Remove a job from the scheduling queue.
batch Execute queue only when system resources permit.
crontab ...

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