Direct mail is a broad term that includes the following types of mailed promotions: Institutional direct mail serves to promote the name of the publishing house with no reasonable expectation of sales revenues.
The touch command is the easiest way to create new, empty files. It is also used to change the timestamps (i.e., dates and times of the most recent access and modification) on existing files and directories. touch's syntax is. touch [option] file_name(s)
On most Unix systems, you can use the uname command to determine which Unix system (e.g., SunOS, AIX, IRIX, Linux, Darwin) is running on your computer. On most systems, to obtain additional information about the operating system, at the Unix prompt, enter: