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WATCH(8) FreeBSD System Manager's Manual WATCH(8)


[править] NAME

    watch — snoop on another tty line

[править] SYNOPSIS

    watch [-cinotW] [-f snpdev] [tty]


    The watch 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, watch will attempt to load the module (snp).  The watch util‐
    ity writes to standard output.
    The options are as follows:
    -c      Reconnect on close.  If the tty observed by watch is closed,
            automatically reattach to the same tty.  If this option is not
            specified, watch 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, watch will use snpdev as the snp(4)
            device.  Without this option, watch will attempt to find the next
            available snp(4) device.
    -i      Force interactive mode.  Interactive mode is a default if watch
            is started from a tty.  If output is redirected to a file, inter‐
            active 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 over‐
            flows.  In all cases where a prompt would be displayed, watch
            will exit.  The reconnect flags are unaffected by this option.
            When this flag is used, <control-X> is passed through to the ter‐
    -o      Reconnect on overflow.  The behavior of watch 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
    -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/.

[править] OPERATION

    While running in interactive mode, all user input is discarded except
          Exit watch.
          Clear screen.
          Change attached tty, unless this feature is disabled, in which case
          control-X is passed to the terminal as with other control charac‐

[править] SEE ALSO

    pty(4), sio(4), snp(4), kldload(8)

[править] HISTORY

    The watch utility first appeared in FreeBSD 2.1.

[править] AUTHORS

    Ugen J.S. Antsilevich <>

[править] BUGS

    No terminal emulation is performed.  All user output is reproduced as-is.

FreeBSD 9.0 November 24, 2001 FreeBSD 9.0

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