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System Administration Guide: Advanced Administration
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1.  Managing Terminals and Modems (Overview)

2.  Setting Up Terminals and Modems (Tasks)

3.  Managing Serial Ports With the Service Access Facility (Tasks)

4.  Managing System Resources (Overview)

5.  Displaying and Changing System Information (Tasks)

6.  Managing Disk Use (Tasks)

7.  Managing UFS Quotas (Tasks)

8.  Scheduling System Tasks (Tasks)

Creating and Editing crontab Files (Task Map)

Ways to Automatically Execute System Tasks

For Scheduling Repetitive Jobs: crontab

For Scheduling a Single Job: at

Scheduling a Repetitive System Task (cron)

Inside a crontab File

How the cron Daemon Handles Scheduling

Syntax of crontab File Entries

Creating and Editing crontab Files

How to Create or Edit a crontab File

How to Verify That a crontab File Exists

Displaying crontab Files

How to Display a crontab File

Removing crontab Files

How to Remove a crontab File

Controlling Access to the crontab Command

How to Deny crontab Command Access

How to Limit crontab Command Access to Specified Users

How to Verify Limited crontab Command Access

Using the at Command (Task Map)

Scheduling a Single System Task (at)

Description of the at Command

Controlling Access to the at Command

How to Create an at Job

How to Display the at Queue

How to Verify an at Job

How to Display at Jobs

How to Remove at Jobs

How to Deny Access to the at Command

How to Verify That at Command Access Is Denied

9.  Managing System Accounting (Tasks)

10.  System Accounting (Reference)

11.  Managing System Performance (Overview)

12.  Managing System Processes (Tasks)

13.  Monitoring System Performance (Tasks)

14.  Troubleshooting Software Problems (Overview)

15.  Managing System Messages

16.  Managing Core Files (Tasks)

17.  Managing System Crash Information (Tasks)

18.  Troubleshooting Miscellaneous Software Problems (Tasks)

19.  Troubleshooting File Access Problems (Tasks)

20.  Resolving UFS File System Inconsistencies (Tasks)

21.  Troubleshooting Software Package Problems (Tasks)


Chapter 8

Scheduling System Tasks (Tasks)

This chapter describes how to schedule routine or single (one-time) system tasks by using the crontab and at commands.

This chapter also explains how to control access to these commands by using the following files:

For information on the procedures that are associated with scheduling system tasks, see the following: