[Solved] What is the effect of this command? exec 3>&1 - Ans: Creates a new file descriptor 3 that points to standard output | Bash Scripting

Bash Scripting - File Operations in Scripts

What is the effect of this command?

exec 3>&1

ARedirects standard error to file descriptor 1

BCloses file descriptor 3

CRedirects standard output to file descriptor 3

DCreates a new file descriptor 3 that points to standard output

Step-by-Step Solution

Solution:

Step 1: Understand exec with file descriptors
exec 3>&1 duplicates stdout (fd 1) to fd 3, creating a new descriptor.
Step 2: Interpret the effect
Fd 3 now points to the same place as stdout, allowing later use.
Final Answer:
Creates a new file descriptor 3 that points to standard output -> Option D
Quick Check:
exec 3>&1 duplicates stdout to fd 3 [OK]

Quick Trick: exec n>&m duplicates fd m to fd n [OK]

Common Mistakes:

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