DragonFly On-Line Manual Pages

Search: Section:  

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


watch -- snoop on another tty line


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- minal. -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 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/.


While running in interactive mode, all user input is discarded except for: <control-G> Exit watch. <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 charac- ters.


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


The watch utility first appeared in FreeBSD 2.1.


Ugen J.S. Antsilevich <ugen@NetVision.net.il>


No terminal emulation is performed. All user output is reproduced as-is. DragonFly 3.5 November 24, 2001 DragonFly 3.5

Search: Section: