Unit VI: Security and System Handling

Security should be one of the foremost thoughts at all stages of setting up our Linux computer. To implement a good security policy on a machine requires a good knowledge of the fundamentals of Linux as well as some of the applications and protocols that are used.

In this “Security and System Handling - Linux” you will learn about following topics:

Understanding Shell Scripts
Executing and Debugging Shell Scripts
Understanding Shell Variables
Performing Arithmetic in Shell Scripts
Using Programming Constructs In Shell Scripts
System Start-Up and Shut Down
Starting Run-Level Scripts
Changing Run-Level Script Behavior
Reorganizing Or Removing Run-Level Scripts
Adding Run-Level Scripts
Manipulating Run Levels
Scheduling System Tasks
Submitting Scheduled Jobs
Viewing Scheduled Jobs
Deleting Scheduled Jobs
Using the Cron Facility
Modifying Scheduled Tasks With Crontab
Understanding Cron Files
Backing Up and Restoring
Selecting a Backup Strategy
Selecting a Backup Medium
Backing Up Files with dump
Automating Backups with cron
Restoring Backed Up Files
Using Password Protection
Choosing Good Passwords
Using A Shadow Password File
Breaking Encrypted Passwords
Checking For The Shadow Password File
File Security
Ownership of Linux files
Permissions
Finding Files with Unwanted Permissions
The File Mask
Files Versus Directories

========== Point to Note ==========

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