ons may be unary or binary. Unary expressions are often used to examine the status of a file. There are string operators and numeric co... on operators as well. If the file argument to one of the primaries is of the form `/dev/fd/N', then file descriptor N is checked. If the file argument to one of the primaries is one of `/dev/stdin', `/dev/stdout', or `/dev/stderr', fi... True if shell option optname is enabled. The list of options appears in the description of the `-o' option to the set builtin (see section 4
his functionality as a command, but a combination of commands will make this work.
The stty command s... racters should be echoed to the terminal. To turn off echoing, the command stty -echo can be used. Any... ssumption that echo is on. In some cases, echoing of characters is done at the local terminal (in whic... cannot prevent echoing passwords) and the result of the second command will be that every character t
