Files are used to create processes and
processes do things with or to files.
processes do things with or to files.
Files may be created or
modified using "stdin" - aka, keyboard or other devices,
and also from the output of processes, known as "stdout".
There is a third value, "stderr", which reports errors to "stdout".
and also from the output of processes, known as "stdout".
There is a third value, "stderr", which reports errors to "stdout".
stdin, stdout and stderr can all be redirected, piped, filtered and modified at the command line.
Linux uses