单选题：How could you describe the following command line?
How could you describe the following command line? @[D](1)
foo || bar
A. The command foo redirect its output to the command bar.
B. The command foo writes its output into the file bar.
C. The command bar is only processed if the command foo leaves without error.
D. The command bar is only processed if the command foo leaves with an error.
A.The command foo redirect its output to the command bar.
B.The command foo writes its output into the file bar.
C.The command bar is only processed if the command foo leaves without error.
D.The command bar is only processed if the command foo leaves with an error.
答案：D
foo || bar
A. The command foo redirect its output to the command bar.
B. The command foo writes its output into the file bar.
C. The command bar is only processed if the command foo leaves without error.
D. The command bar is only processed if the command foo leaves with an error.
A.The command foo redirect its output to the command bar.
B.The command foo writes its output into the file bar.
C.The command bar is only processed if the command foo leaves without error.
D.The command bar is only processed if the command foo leaves with an error.
答案：D