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+.TH CHECKNR 1 4/5/80
+.UC 4
+.SH NAME
+checknr \- check nroff/troff files
+.SH SYNOPSIS
+.B checknr
+[
+.B \-s
+] [
+.B \-f
+] [
+.BR \-a ".x1.y1.x2.y2. ... .xn.yn"
+] [
+.BR \-c ".x1.x2.x3 ... .xn"
+]
+\fIfile\fP ...
+.SH DESCRIPTION
+.I Checknr
+checks a list of
+.IR nroff (1)
+or
+.IR troff (1)
+input files for certain kinds of errors
+involving mismatched opening and closing delimiters
+and unknown commands.
+Delimeters checked are:
+.IP (1)
+Font changes using \efx ... \efP.
+.IP (2)
+Size changes using \esx ... \es0.
+.IP (3)
+Macros that come in open ... close forms, for example,
+the .TS and .TE macros which must always come in pairs.
+.PP
+.I Checknr
+knows about the
+.IR ms (7)
+and
+.IR me (7)
+macro packages.
+.PP
+Additional pairs of macros can be added to the list using the
+.B \-a
+option.
+This must be followed by groups of six characters, each group defining
+a pair of macros.
+The six characters are
+a period,
+the first macro name,
+another period,
+and the second macro name.
+For example, to define a pair .BS and .ES, use \-\fBa\fP.BS.ES
+.PP
+The
+.B \-c
+option defines commands which would otherwise be complained about
+as undefined.
+.PP
+The
+.B \-f
+option requests
+.I checknr
+to ignore \ef font changes.
+.PP
+The
+.B \-s
+option requests
+.I checknr
+to ignore \es size changes.
+.PP
+.I Checknr
+is intended to be used on documents that are prepared with
+.I checknr
+in mind, much the same as
+.I lint.
+It expects a certain document writing style for \ef and \es commands,
+in that each \efx must be terminated with \efP and
+each \esx must be terminated with \es0.
+While it will work to directly go into the next font or explicitly
+specify the original font or point size,
+and many existing documents actually do this,
+such a practice will produce complaints from
+.I checknr.
+Since it is probably better to use the \efP and \es0 forms anyway,
+you should think of this as a contribution to your document
+preparation style.
+.SH SEE\ ALSO
+nroff(1), troff(1), ms(7), me(7), checkeqn(1)
+.SH DIAGNOSTICS
+Complaints about unmatched delimiters.
+.br
+Complaints about unrecognized commands.
+.br
+Various complaints about the syntax of commands.
+.SH AUTHOR
+Mark Horton
+.SH BUGS
+There is no way to define a 1 character macro name using
+.B \-a