The task requires two simultaneous actions: viewing a log file in real time and saving that same output to another file. The tail -f command follows a file, printing new lines to standard output as they are added, which satisfies the "real time" viewing requirement. The tee command reads from standard input and writes to both standard output (the screen) and a specified file. By piping (|) the output of tail -f to tee logfile.txt, the administrator can see the real-time log updates on the terminal while tee simultaneously saves an identical copy to logfile.txt.

A. The > redirection operator sends standard output to logfile.txt instead of the screen, so the administrator would not see the log in real time.

B. The pipe | operator is used to send the output of one command to the input of another command, not directly to a file. This syntax is incorrect.

C. The >> redirection operator appends standard output to logfile.txt. Similar to >, the output would not be displayed on the screen for real-time review.

1. The GNU Project. (2020). GNU Coreutils Manual

Section 11.1 tail: Output the last part of files and Section 14.1 tee: Redirect output to multiple files or processes. The documentation describes the -f option for tail and the function of tee to split output.

2. Stanford University. (2019). CS107: Computer Organization & Systems

Lecture 03: The UNIX Command Line. Course materials cover I/O redirection and pipes

explaining the distinct functions of >

>>

|

and the utility of tee for splitting output streams.

3. Red Hat Enterprise Linux 8 Documentation. (2023). Configuring basic system settings

Chapter 25. Managing log files. Section 25.1.2 discusses using tail and other utilities for monitoring log files in real time.