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.
cd ~. The cd command is used to change the current directory (i.e., the directory in which the user is currently working) in Linux and other Unix-like operating systems.It is similar to the CD and CHDIR commands in MS-DOS.cd [option] [directory].he cd Command. The cd command is used to change the current directory (i.e., the directory in which the user is currently working) in Linux and other Unix-like operating systems.