The command that will send output from the program 'myapp' to both standard output (stdout) and the file 'file1.log' is 'myapp | tee file1.log'. Option D is the correct answer.
The 'tee' command is used to redirect output from a command to multiple places, including stdout and a file. It takes the output from the command on its standard input and writes it to both stdout and the specified file.
To send output from the program 'myapp' to both stdout and the file 'file1.log', you can use the following command:
myapp | tee file1.log
This command will execute the program 'myapp' and redirect its output to the 'tee' command. The 'tee' command will write the output to both stdout and the file 'file1.log'.
The other options do not accurately describe the behavior of the 'tee' command:
Option A: The 'cat < myapp | cat > file1.log' command will not send the output from the program 'myapp' to both stdout and the file 'file1.log'. It will only send the output to the file 'file1.log'.
Option B: The 'myapp 0>&1 | cat > file1.log' command is not a valid command.
Option C: The 'myapp | cat > file1.log' is incorrect because it will only send the output from the program 'myapp' to the file 'file1.log'. It will not send the output to stdout.
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