3278021b94
was never technically true (it's snp(4) that required root, not watch(8)), and after snp.c 1.64, isn't even effectively true, since who can run watch(8) depends on the permissions of the snp device(s). Sort options in SYNOPSIS and DESCRIPTION while I'm here.
105 lines
2.4 KiB
Groff
105 lines
2.4 KiB
Groff
.\"
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.\" @(#)watch.8 1.1 (FreeBSD) 2/17/95
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.\" $FreeBSD$
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.\"
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.Dd November 24, 2001
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.Dt WATCH 8
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.Os
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.Sh NAME
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.Nm watch
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.Nd snoop on another tty line
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.Sh SYNOPSIS
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.Nm
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.Op Fl cinotW
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.Op Fl f Ar snpdev
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.Op Ar tty
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.Sh DESCRIPTION
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.Nm Watch
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allows the superuser to examine all data coming through a specified tty.
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.Nm Watch
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writes to standard output.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl c
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Reconnect on close. If the tty observed by
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.Nm
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is closed, automatically reattach to the same tty.
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If this option is not specified,
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.Nm
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will request a new tty if running in interactive mode or exit if running
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without a controlling tty.
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.It Fl f Ar snpdev
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If this option is specified,
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.Nm
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will use
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.Ar snpdev
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as the
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.Xr snp 4
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device.
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Without this option,
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.Nm
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will attempt to find the next available
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.Xr snp 4
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device.
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.It Fl i
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Force interactive mode.
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Interactive mode is a default if
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.Nm
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is started from a tty.
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If output is redirected to a file, interactive mode can still be requested
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by specifying this option.
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.It Fl n
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Disable the ability to switch the watched tty interactively. This disables
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both change requests made with <control-X> as well as automatic prompting
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when the current tty is closed or overflows. In all cases where a prompt
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would be displayed,
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.Nm
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will exit. The reconnect flags are unaffected by
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this option.
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When this flag is used, <control-X> is passed through to the terminal.
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.It Fl o
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Reconnect on overflow.
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The behavior of
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.Nm
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if the observed tty overflows is similar to the behavior if the observed tty
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is closed.
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For more info see
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.Xr snp 4 .
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.It Fl t
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Print the date and time when observation of a given tty is started.
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.It Fl W
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Allow write access to observed tty.
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.It Ar tty
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Tty may be specified as an tty-style device, such as a pseudo tty device,
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a virtual console, or a serial line, etc.
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Names may be preceded by
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.Pa /dev/ .
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.El
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.Sh OPERATION
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While running in interactive mode, all user input is discarded except for:
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.Pp
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.Bl -tag -width "XXXX" -compact
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.It Sy "<control-G>"
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Exit
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.Nm .
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.It Sy "<control-W>"
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Clear screen.
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.It Sy "<control-X>"
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Change attached tty, unless this feature is disabled, in which case
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control-X is passed to the terminal as with other control characters.
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.El
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.Sh SEE ALSO
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.Xr pty 4 ,
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.Xr sio 4 ,
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.Xr snp 4
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.Sh BUGS
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No terminal emulation is performed.
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All user output is reproduced as-is.
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.Sh AUTHORS
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.An Ugen J.S. Antsilevich Aq ugen@NetVision.net.il
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.Sh HISTORY
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.Nm Watch
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first appeared in
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.Fx 2.1 .
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