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+.Dd $Mdocdate$
+.Dt WHEN 1
+.Os
+.Sh NAME
+.Nm when
+.Nd a simple file watcher
+.
+.Sh SYNPOSIS
+.Nm when
+.Op Fl i
+.Ar file ...
+.
+.Sh DESCRIPTION
+.Pp
+.Nm when
+is a simple program that watches any given
+.Ar file
+for changes.
+When the file changes, its name (as specified in the arguments to
+.Nm when )
+is printed on standard output.
+.Pp
+If the
+.Fl i
+argument is provided, an initial such line is printed when the program
+starts, before beginning to watch for changes.
+.
+.Sh ERRORS
+.Pp
+If one of the watched files is deleted, a message is printed on standard
+error and the program exits with error code 1.
+.Pp
+If a file is renamed, a notice is printed on standard error, but the
+program keeps running.
+.
+.Sh EXAMPLES
+.Bd -literal -offset indent
+when * | xargs -I% cp % /mnt/usb/
+.Ed
+.Bd -literal -offset indent
+when -i *.ms | while read f; do
+	make "${f%.ms}".pdf && kill -HUP mupdf
+done
+.Ed
+.
+.Sh AUTHORS
+.Pp
+.Nm when
+is written by
+.An John Ankarström Aq Mt "john (at) ankarstrom.se" .