121 lines
2.5 KiB
Groff
121 lines
2.5 KiB
Groff
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd November 24, 2001
|
|
.Dt WATCH 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm watch
|
|
.Nd snoop on another tty line
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl cinotW
|
|
.Op Fl f Ar snpdev
|
|
.Op Ar tty
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility allows the user to examine all data coming through a specified tty
|
|
using the
|
|
.Xr snp 4
|
|
device.
|
|
If the
|
|
.Xr snp 4
|
|
device is not available,
|
|
.Nm
|
|
will attempt to load the module
|
|
.Pq Nm snp .
|
|
The
|
|
.Nm
|
|
utility writes to standard output.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width indent
|
|
.It Fl c
|
|
Reconnect on close.
|
|
If the tty observed by
|
|
.Nm
|
|
is closed, automatically reattach to the same tty.
|
|
If this option is not specified,
|
|
.Nm
|
|
will request a new tty if running in interactive mode or exit if running
|
|
without a controlling tty.
|
|
.It Fl f Ar snpdev
|
|
If this option is specified,
|
|
.Nm
|
|
will use
|
|
.Ar snpdev
|
|
as the
|
|
.Xr snp 4
|
|
device.
|
|
Without this option,
|
|
.Nm
|
|
will attempt to find the next available
|
|
.Xr snp 4
|
|
device.
|
|
.It Fl i
|
|
Force interactive mode.
|
|
Interactive mode is a default if
|
|
.Nm
|
|
is started from a tty.
|
|
If output is redirected to a file, interactive mode can still be requested
|
|
by specifying this option.
|
|
.It Fl 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,
|
|
.Nm
|
|
will exit.
|
|
The reconnect flags are unaffected by
|
|
this option.
|
|
When this flag is used, <control-X> is passed through to the terminal.
|
|
.It Fl o
|
|
Reconnect on overflow.
|
|
The behavior of
|
|
.Nm
|
|
if the observed tty overflows is similar to the behavior if the observed tty
|
|
is closed.
|
|
For more info see
|
|
.Xr snp 4 .
|
|
.It Fl t
|
|
Print the date and time when observation of a given tty is started.
|
|
.It Fl W
|
|
Allow write access to observed tty.
|
|
.It Ar 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
|
|
.Pa /dev/ .
|
|
.El
|
|
.Sh OPERATION
|
|
While running in interactive mode, all user input is discarded except for:
|
|
.Pp
|
|
.Bl -tag -width "XXXX" -compact
|
|
.It Sy "<control-G>"
|
|
Exit
|
|
.Nm .
|
|
.It Sy "<control-W>"
|
|
Clear screen.
|
|
.It Sy "<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.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr pty 4 ,
|
|
.Xr sio 4 ,
|
|
.Xr snp 4 ,
|
|
.Xr kldload 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
utility first appeared in
|
|
.Fx 2.1 .
|
|
.Sh AUTHORS
|
|
.An Ugen J.S. Antsilevich Aq Mt ugen@NetVision.net.il
|
|
.Sh BUGS
|
|
No terminal emulation is performed.
|
|
All user output is reproduced as-is.
|