单项选择题 Operator needs to remove all leading comments # from shell.script file. Which of the following vi sub-command can achieve this?（）

单项选择题 An operator needs to run a script which will write standard output and standard error to different files. Which of the following commands will successfully perform this task?（）

单项选择题 Which of the following will permit an operator to retrieve console log output from the command line?（）