Unix was developed as a command line interface in the early 1970s with a very rich command vocabulary. DOS followed more than a decade later for the IBM PC, and DOS commands migrated to Windows.

is the name of a UNIX command, executable program, or shell script to which you want to route output or from which you want to read input. The command(s) must be enclosed in either double or single ...

A customer account with an Internet service provider (ISP) that requires the user to enter Unix commands to send and receive mail and files. Prior to today's graphical interfaces, Internet access ...

Refer to SAS Macro Language: Reference for more information on quoting functions. Enter 'exit' to return to your SAS session. SAS then starts a shell. Enter any UNIX commands. When you are ready to ...