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.
touch (Unix) touch is a standard Unix command-line interface program which is used to update the access date and / or modification date of a file or directory. In its default usage, it is the equivalent of creating or opening a file and saving it without any change to the file contents.
echo $PS1. A command prompt, also referred to simply as a prompt, is a short text message at the start of the command line on a command line interface. A command line interface (CLI) is an all-text display mode that is provided in a console or terminal window by a shell. command is an instruction to tell a computer to do something, e.g., to execute a program. The functions of a command prompt are (1) to inform the user that the system is ready for the next command, data element or other input and (2) to help the user plan and execute subsequent operations.