Users typically interact with a Unix shell using a terminal emulator; however, direct operation via serial hardware connections or Secure Shell are common for server systems. All Unix shells provide filename wildcarding, piping, here documents, command substitution, variables and control structures for condition-testing and iteration.
users typically interact with a unix shell using a terminal emulator; however direct operation via serial hardware connections or secure shell are common for server systems all unix shells provide filename wildcarding piping here documents command substitution variables and control structures for condition-testing and iteration