.TH PDIFF 1P "22 June 1983"
.UC 4
.SH NAME
pdiff \- differential project comparator
.SH SYNOPSIS
.B pdiff
[\fB\-rx\fR] [\fB\-T \fRtypexpr] [diff options] projectname1 projectname2
.PP
.B pdiff
[\fB\-x\fR] [diff options] pdirname1 pdirname2
.PP
.B pdiff
[\fB\-x\fR] [diff options] file1 file2
.SH DESCRIPTION
.I Pdiff
compares files in projects using the
.I diff
command.
.I Diff
tells what lines must be changed in the files to bring them into agreement.
Except in rare circumstances, it finds a smallest sufficient set of file
differences.
.PP
If both arguments are projects,
.I pdiff
sorts the project directories in each project by name,
and then runs
.I diff
on the contents of common directories. Binary files that differ,
common subdirectories, and files that appear in only one directory are
listed.
.PP
If
.I pdirname1
is a project, then a project directory in that project with the same name as
.I pdirname2
is used (and vice versa).
.PP
If
.I file1
is a project, then a file in that project with the same name as
.I file2,
residing in a project directory with the same name as the current working
project directory, is used (and vice versa).
.SH OPTIONS
.IP \fB\-r\fR
Apply
.I pdiff
recursively to common subprojects.
.IP \fB\-x\fR
Trace and print
.I diff
commands, but do not execute.
.IP "\fB\-T \fItypexpr\fR"
Only compare project directories corresponding to
boolean type label expression,
.I typexpr.
.SH "SEE ALSO"
diff(1)
.SH DIAGNOSTICS
The error message ``pdiff: don't know which project directory to use in
\fIprojectname\fR'' indicates that the file or directory that is being
compared against
.I projectname
is not part of the current working project.
.PP
Exit status is 0 for no differences, 1 for some, 2 for trouble.
.SH AUTHOR
Peter J. Nicklin