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1.1     ! root        1: .TH PDIFF 1P "22 June 1983"
        !             2: .UC 4
        !             3: .SH NAME
        !             4: pdiff \- differential project comparator
        !             5: .SH SYNOPSIS
        !             6: .B pdiff
        !             7: [\fB\-rx\fR] [\fB\-T \fRtypexpr] [diff options] projectname1 projectname2
        !             8: .PP
        !             9: .B pdiff
        !            10: [\fB\-x\fR] [diff options] pdirname1 pdirname2
        !            11: .PP
        !            12: .B pdiff
        !            13: [\fB\-x\fR] [diff options] file1 file2
        !            14: .SH DESCRIPTION
        !            15: .I Pdiff
        !            16: compares files in projects using the
        !            17: .I diff
        !            18: command.
        !            19: .I Diff
        !            20: tells what lines must be changed in the files to bring them into agreement.
        !            21: Except in rare circumstances, it finds a smallest sufficient set of file
        !            22: differences.
        !            23: .PP
        !            24: If both arguments are projects,
        !            25: .I pdiff
        !            26: sorts the project directories in each project by name,
        !            27: and then runs
        !            28: .I diff
        !            29: on the contents of common directories. Binary files that differ,
        !            30: common subdirectories, and files that appear in only one directory are
        !            31: listed.
        !            32: .PP
        !            33: If
        !            34: .I pdirname1
        !            35: is a project, then a project directory in that project with the same name as
        !            36: .I pdirname2
        !            37: is used (and vice versa).
        !            38: .PP
        !            39: If
        !            40: .I file1
        !            41: is a project, then a file in that project with the same name as
        !            42: .I file2,
        !            43: residing in a project directory with the same name as the current working
        !            44: project directory, is used (and vice versa).
        !            45: .SH OPTIONS
        !            46: .IP \fB\-r\fR
        !            47: Apply
        !            48: .I pdiff
        !            49: recursively to common subprojects.
        !            50: .IP \fB\-x\fR
        !            51: Trace and print
        !            52: .I diff
        !            53: commands, but do not execute.
        !            54: .IP "\fB\-T \fItypexpr\fR"
        !            55: Only compare project directories corresponding to
        !            56: boolean type label expression,
        !            57: .I typexpr.
        !            58: .SH "SEE ALSO"
        !            59: diff(1)
        !            60: .SH DIAGNOSTICS
        !            61: The error message ``pdiff: don't know which project directory to use in
        !            62: \fIprojectname\fR'' indicates that the file or directory that is being
        !            63: compared against
        !            64: .I projectname
        !            65: is not part of the current working project.
        !            66: .PP
        !            67: Exit status is 0 for no differences, 1 for some, 2 for trouble.
        !            68: .SH AUTHOR
        !            69: Peter J. Nicklin

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