Computer Science Illuminated
Computer Science Illuminated
6th Edition
ISBN: 9781284055917
Author: Nell Dale, John Lewis
Publisher: Jones & Bartlett Learning
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Chapter 11, Problem 48E

a.

Program Plan Intro

Path:

To represent the path of the file, first identify the type of the environment in the operating system.

  • The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file.
  • The path can be represented in two ways,
    • Absolute path:
      • It specifies the path of the file step by step, from the root of the directory.
      • The path of the file starts from the root directory.
      • Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system.
    • Relative path:
      • It specifies the name from the current working directory.
      • Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system.

The following diagram represents the directory tree structure on UNIX environment.

Computer Science Illuminated, Chapter 11, Problem 48E

  • Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

  • To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.
  • Here, the root directory starts with the forward slash (/)...

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

  • To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.
  • Here, the root directory starts with the forward slash (/)...

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

  • To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.
  • Here, the root directory starts with the forward slash (/)...

Explanation of Solution

e.

Absolute path for “week3.txt” file:

From the above directory structure -

  • To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.
  • Here, the root directory starts with the forward slash (/).
  • Under the root directory “/”, there are five parent directories such as:
    • usr
    • home...

Explanation of Solution

f.

Absolute path for “printall” file:

From the above directory structure,

  • To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.
  • Here, the root directory starts with the forward slash (/).
  • Under the root directory “/”, there are five parent directories such as:
    • usr
    • home

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