Интерактивная система просмотра системных руководств (man-ов)
watch (8)
watch (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
watch (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
>> watch (8) ( FreeBSD man: Команды системного администрирования )
BSD mandoc
NAME
watch
- snoop on another tty line
SYNOPSIS
[-cinotW
]
[-f snpdev
]
[tty
]
DESCRIPTION
The
utility allows the user to examine all data coming through a specified tty
using the
snp(4)
device.
If the
snp(4)
device is not available,
will attempt to load the module
(snp
)
The
utility writes to standard output.
The options are as follows:
-c
Reconnect on close.
If the tty observed by
is closed, automatically reattach to the same tty.
If this option is not specified,
will request a new tty if running in interactive mode or exit if running
without a controlling tty.
-f snpdev
If this option is specified,
will use
snpdev
as the
snp(4)
device.
Without this option,
will attempt to find the next available
snp(4)
device.
-i
Force interactive mode.
Interactive mode is a default if
is started from a tty.
If output is redirected to a file, interactive mode can still be requested
by specifying this option.
-n
Disable the ability to switch the watched tty interactively.
This disables
both change requests made with <control-X> as well as automatic prompting
when the current tty is closed or overflows.
In all cases where a prompt
would be displayed,
will exit.
The reconnect flags are unaffected by
this option.
When this flag is used, <control-X> is passed through to the terminal.
-o
Reconnect on overflow.
The behavior of
if the observed tty overflows is similar to the behavior if the observed tty
is closed.
For more info see
snp(4).
-t
Print the date and time when observation of a given tty is started.
-W
Allow write access to observed tty.
tty
Tty may be specified as a tty-style device, such as a pseudo tty device,
a virtual console, or a serial line, etc.
Names may be preceded by
/dev/
OPERATION
While running in interactive mode, all user input is discarded except for:
<control-G>
Exit
.
<control-W>
Clear screen.
<control-X>
Change attached tty, unless this feature is disabled, in which case
control-X is passed to the terminal as with other control characters.
