Answer :
Final answer:
A line editor in Unix allows editing one line at a time without a visual interface, while a screen editor allows editing multiple lines simultaneously with a visual interface.
Explanation:
In Unix, the main difference between a line editor and a screen editor lies in their interface and operational mechanics. A line editor, such as ED in Unix, allows users to edit one line at a time. It does not allow users to visually navigate through multiple lines of the file. This was primarily used in the early days of computing when graphical interfaces were not available.
On the other hand, a screen editor like VI and EMACS in Unix allows users to navigate and edit multiple lines on the screen simultaneously. These editors provide a visual interface to edit files, showing a portion of the file on the screen, and the cursor can be moved around to different positions for editing. This type of editor made working with files more user-friendly with the advent of graphical user interfaces.
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