OS Two level Directory

OS Two level Directory with Definition and functions, OS Tutorial, Types of OS, Process Management Introduction, Attributes of a Process, Process Schedulers, CPU Scheduling, SJF Scheduling, FCFS with overhead, FCFS Scheduling etc.

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Two Level Directory

In two level directory systems, we can create a separate directory for each user. There is one master directory which contains separate directories dedicated to each user. For each user, there is a different directory present at the second level, containing group of user's file. The system doesn't let a user to enter in the other user's directory without permission.

Characteristics of two level directory system

Each files has a path name as /User-name/directory-name/
Different users can have the same file name.
Searching becomes more efficient as only one user's list needs to be traversed.
The same kind of files cannot be grouped into a single directory for a particular user.

Every Operating System maintains a variable as PWD which contains the present directory name (present user name) so that the searching can be done appropriately.

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