File: relpath.pas

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program relpath;
uses
  SysUtils;

var
	BaseDir: string;
	TargetDir: string;
begin
	TargetDir := ParamStr(1);
	BaseDir := ParamStr(2);
	if BaseDir = ''
	then begin
		BaseDir := GetCurrentDir;
	end;
	WriteLn(ExtractRelativePath(IncludeTrailingPathDelimiter(BaseDir), TargetDir));
end.