/usr/bin/gpionotify

Usage: /usr/bin/gpionotify [OPTIONS] <line>...

Wait for changes to info on GPIO lines and print them to standard output.

Lines are specified by name, or optionally by offset if the chip option
is provided.

Options:
      --banner		display a banner on successful startup
      --by-name		treat lines as names even if they would parse as an offset
  -c, --chip <chip>	restrict scope to a particular chip
  -e, --event <event>	specify the events to monitor
			Possible values: 'requested', 'released', 'reconfigured'.
			(default is all events)
  -h, --help		display this help and exit
  -F, --format <fmt>	specify a custom output format
      --idle-timeout <period>
			exit gracefully if no events occur for the period specified
      --localtime	convert event timestamps to local time
  -n, --num-events <num>
			exit after processing num events
  -q, --quiet		don't generate any output
  -s, --strict		abort if requested line names are not unique
      --unquoted	don't quote line or consumer names
      --utc		convert event timestamps to UTC
  -v, --version		output version information and exit

Chips:
    A GPIO chip may be identified by number, name, or path.
    e.g. '0', 'gpiochip0', and '/dev/gpiochip0' all refer to the same chip.

Periods:
    Periods are taken as milliseconds unless units are specified. e.g. 10us.
    Supported units are 'm', 's', 'ms', and 'us' for minutes, seconds, milliseconds and
    microseconds respectively.

Format specifiers:
  %o   GPIO line offset
  %l   GPIO line name
  %c   GPIO chip name
  %e   numeric info event type ('1' - requested, '2' - released or '3' - reconfigured)
  %E   info event type ('requested', 'released' or 'reconfigured')
  %a   line attributes
  %C   consumer
  %S   event timestamp as seconds
  %U   event timestamp as UTC
  %L   event timestamp as local time