Which of the following statements is correct regarding the command foo 1> bar?

B

The command foo 1> bar redirects the standard output (stdout) of the command foo to the file bar. Here, 1 represents the file descriptor for stdout.

Option A states that the stdout from the command foo is appended to the file bar. However, there is no >> used in the command, which means that the output will overwrite the contents of the file bar instead of appending to it. Therefore, option A is incorrect.

Option B states that the stdout from the command foo overwrites the file bar. This is the correct answer. Since > is used instead of >>, the output of the command will overwrite the file bar if it already exists. If bar does not exist, a new file with the name bar will be created and the stdout of foo will be written to it.

Option C suggests that the command foo receives its stdin from the file bar. However, the command foo does not have any input redirection symbol like < used in the command. Therefore, option C is incorrect.

Option D suggests that the command foo receives its stdin from the stdout of the command bar. However, there is no pipe symbol (|) used in the command, which would have indicated that the output of bar is being passed as input to foo. Therefore, option D is incorrect.

Option E suggests that the stderr from the command foo is saved to the file bar. However, 1> redirects only the stdout of the command, not the stderr. To redirect the stderr, 2> would be used instead of 1>. Therefore, option E is incorrect.

In summary, option B is correct, which states that the stdout from the command foo overwrites the file bar.