87 lines
2.1 KiB
Groff
87 lines
2.1 KiB
Groff
.\"
|
|
.\" @(#)watch.8 1.1 (FreeBSD) 2/17/95
|
|
.\"
|
|
.Dd February 17, 1995
|
|
.Dt WATCH 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm watch
|
|
.Nd snoop on another tty line
|
|
.Sh SYNOPSIS
|
|
.Nm watch
|
|
.Op Fl ciotnW
|
|
.Ar tty
|
|
.\" watch [-ciotnW] [<tty name>]
|
|
.Sh DESCRIPTION
|
|
.Nm Watch
|
|
allows the superuser to examine all data coming through a specified tty.
|
|
.Nm Watch
|
|
writes to standard output.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width "-l nul "
|
|
.It Fl c
|
|
Reconnect on close. If the tty observed by
|
|
.Nm watch
|
|
is closed, automatically reattach to the same tty.
|
|
If this option is not specified,
|
|
.Nm watch
|
|
will request a new tty if running in interactive mode or exit if running
|
|
without a controlling tty.
|
|
.It Fl i
|
|
Force interactive mode.
|
|
Interactive mode is a default if
|
|
.Nm watch
|
|
is started from a tty.
|
|
If output is redirected to a file, interactive mode can still be requested
|
|
by specifying this option.
|
|
.It Fl o
|
|
Reconnect on overflow.
|
|
The behavior of
|
|
.Nm watch
|
|
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 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, watch will exit. The reconnect flags are unaffected by
|
|
this option.
|
|
.It Fl W
|
|
Allow write access to observed tty.
|
|
.It Ar tty
|
|
Tty may be specified as an tty-style device, such as a pseudo tty device,
|
|
a virtual console, or a serial line, etc.
|
|
Names may be preceded by "/dev/".
|
|
.Sh OPERATION
|
|
While running in interactive mode, all user input is discarded except for:
|
|
.Pp
|
|
.Bl -tag -width "XXXX" -compact
|
|
.It Sy "<control-Q>"
|
|
Exit
|
|
.Nm watch .
|
|
.It Sy "<control-W>"
|
|
Clear screen.
|
|
.It Sy "<control-X>"
|
|
Change attached tty.
|
|
.Sh RESTRICTIONS
|
|
Only the superuser can run
|
|
.Nm watch .
|
|
.Sh SEE ALSO
|
|
.Xr snp 4 ,
|
|
.Xr pty 4 ,
|
|
.Xr sio 4 .
|
|
.Sh BUGS
|
|
No terminal emulation is performed.
|
|
All user output is reproduced as-is.
|
|
.Sh AUTHOR
|
|
Ugen J.S. Antsilevich <ugen@NetVision.net.il>
|
|
.Sh HISTORY
|
|
.Nm Watch
|
|
first appeared in
|
|
.Fx 2.1 .
|