| -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, interactive 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 overflows. 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 terminal. |
| -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/. |
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