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.
One of the basic command in linux shell is the ls. The ls unix command is one of the most used in dealing with shell. Basically the ls command is use to list files and subdirectory of the directory. It accepts a lot of options and depending on your needs regex patterns are also accepted. We will go through each examples on the use of ls.