单项选择题
A. If the file exists it will be opened for editing. If the file does not exist an error message will be displayed.
B. If the file exists it will be opened for editing. If the file does not exist a new file with the name file.out will be created and opened for editing.
C. If the file exists an error message will be displayed. If the file does not exist a new file with the name file.out will be created and opened for editing.
D. If the file exists the operator will be asked whether to open the file or overwrite the file. If the file does not exist a new file with the name file.out will be created and opened for editing.
单项选择题 The man page for command shows the following syntax: The man page for command shows the following syntax: command [ -a | -b ] Which of the following statements is true regarding this entry?（）
单项选择题 An operator is editing a file using a keyboard without arrow keys. What key can be used to move the cursor one character to the right?（）
单项选择题 Which of the following AIX storage concepts is correct?（）