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Lazarus的FileUtil单元包含用以维持Delphi的FileUtil单元的兼容性的函数和过程。专门处理UTF8文件的文件例行程序应该转到LazFileUtils单元。
函数列表

   //文件属性或状态
 function CompareFilenames(const Filename1, Filename2: string): integer; inline;
 function CompareFilenamesIgnoreCase(const Filename1, Filename2: string): integer; inline;
 function CompareFilenames(const Filename1, Filename2: string; ResolveLinks: boolean): integer;
 function CompareFilenames(Filename1: PChar; Len1: integer; Filename2: PChar; Len2: integer; ResolveLinks: boolean): integer;
 function FilenameIsAbsolute(const TheFilename: string):boolean; inline;
 function FilenameIsWinAbsolute(const TheFilename: string):boolean; inline;
 function FilenameIsUnixAbsolute(const TheFilename: string):boolean; inline;
 procedure CheckIfFileIsExecutable(const AFilename: string); inline;
 procedure CheckIfFileIsSymlink(const AFilename: string); inline;
 function FileIsReadable(const AFilename: string): boolean; inline;
 function FileIsWritable(const AFilename: string): boolean; inline;
 function FileIsText(const AFilename: string): boolean; inline;
 function FileIsText(const AFilename: string; out FileReadable: boolean): boolean; inline;
 function FileIsExecutable(const AFilename: string): boolean; inline;
 function FileIsSymlink(const AFilename: string): boolean; inline;
 function FileIsHardLink(const AFilename: string): boolean; inline;
 function FileSize(const Filename: string): int64; overload; inline;
 function GetFileDescription(const AFilename: string): string; inline;
 function ReadAllLinks(const Filename: string; ExceptionOnError: boolean): string; //如果一个链接是破损的，返回''
 function TryReadAllLinks(const Filename: string): string; //如果一个链接是破损的，返回文件名称 
 
   //目录
 function DirPathExists(const FileName: String): Boolean; inline;
 function ForceDirectory(DirectoryName: string): boolean; inline;
 function DeleteDirectory(const DirectoryName: string; OnlyChildren: boolean): boolean;
 function ProgramDirectory: string;
 function DirectoryIsWritable(const DirectoryName: string): boolean; inline;
 
   //文件名称部分
 function ExtractFileNameOnly(const AFilename: string): string; inline;
 function ExtractFileNameWithoutExt(const AFilename: string): string;
 function CompareFileExt(const Filename, Ext: string; CaseSensitive: boolean): integer; overload; inline;
 function CompareFileExt(const Filename, Ext: string): integer; overload; inline;
 function FilenameIsPascalUnit(const Filename: string): boolean;
 function AppendPathDelim(const Path: string): string; inline;
 function ChompPathDelim(const Path: string): string; inline;
 function TrimFilename(const AFilename: string): string; inline;
 function CleanAndExpandFilename(const Filename: string): string; inline;
 function CleanAndExpandDirectory(const Filename: string): string; inline;
 function CreateAbsoluteSearchPath(const SearchPath, BaseDirectory: string): string;
 function CreateRelativePath(const Filename, BaseDirectory: string; UsePointDirectory: boolean = false;  AlwaysRequireSharedBaseFolder: Boolean = True): string; inline;
 function CreateAbsolutePath(const Filename, BaseDirectory: string): string;
 function FileIsInPath(const Filename, Path: string): boolean;
 function FileIsInDirectory(const Filename, Directory: string): boolean; 
 
 //文件搜索
 type
   TSearchFileInPathFlag = (
     sffDontSearchInBasePath,
     sffSearchLoUpCase
     );
   TSearchFileInPathFlags = set of TSearchFileInPathFlag;
 const
   AllDirectoryEntriesMask = '*';
   
 function GetAllFilesMask: string; inline;
 function GetExeExt: string; inline;
 function SearchFileInPath(const Filename, BasePath, SearchPath, Delimiter: string; Flags: TSearchFileInPathFlags): string;
 function SearchAllFilesInPath(const Filename, BasePath, SearchPath, Delimiter: string; Flags: TSearchFileInPathFlags): TStrings;
 function FindDiskFilename(const Filename: string): string;
 function FindDiskFileCaseInsensitive(const Filename: string): string;
 function FindDefaultExecutablePath(const Executable: string; const BaseDir: string = ''): string;
 
 type
  TFileIterator = class
  private
    FPath: String;
    FLevel: Integer;
    FFileInfo: TSearchRec;
    FSearching: Boolean;
    function GetFileName: String;
  public
    procedure Stop;
    function IsDirectory: Boolean;
  public
    property FileName: String read GetFileName;
    property FileInfo: TSearchRec read FFileInfo;
    property Level: Integer read FLevel;
    property Path: String read FPath;
    property Searching: Boolean read FSearching;
  end;
 
  TFileFoundEvent = procedure (FileIterator: TFileIterator) of object;
  TDirectoryFoundEvent = procedure (FileIterator: TFileIterator) of object;
  TDirectoryEnterEvent = procedure (FileIterator: TFileIterator) of object;
 
  TFileSearcher = class(TFileIterator)
  private
    FMaskSeparator: char;
    FFollowSymLink: Boolean;
    FOnFileFound: TFileFoundEvent;
    FOnDirectoryFound: TDirectoryFoundEvent;
    FOnDirectoryEnter: TDirectoryEnterEvent;
    FFileAttribute: Word;
    FDirectoryAttribute: Word;
    procedure RaiseSearchingError;
  protected
    procedure DoDirectoryEnter; virtual;
    procedure DoDirectoryFound; virtual;
    procedure DoFileFound; virtual;
  public
    constructor Create;
    procedure Search(const ASearchPath: String; ASearchMask: String = '';
      ASearchSubDirs: Boolean = True; CaseSensitive: Boolean = False);
  public
    property MaskSeparator: char read FMaskSeparator write FMaskSeparator;
    property FollowSymLink: Boolean read FFollowSymLink write FFollowSymLink;
    property FileAttribute: Word read FFileAttribute write FFileAttribute default faAnyfile;
    property DirectoryAttribute: Word read FDirectoryAttribute write FDirectoryAttribute default faDirectory;
    property OnDirectoryFound: TDirectoryFoundEvent read FOnDirectoryFound write FOnDirectoryFound;
    property OnFileFound: TFileFoundEvent read FOnFileFound write FOnFileFound;
    property OnDirectoryEnter: TDirectoryEnterEvent read FOnDirectoryEnter write FOnDirectoryEnter;
  end;
 
 function [[FindAllFiles]]( const SearchPath: String; SearchMask: String = ''; SearchSubDirs: Boolean = True): TStringList;
 function FindAllDirectories(const SearchPath: string;  SearchSubDirs: Boolean = True): TStringList;
 
  //复制一个文件或一整个目录树
 function [[CopyFile]](const SrcFilename, DestFilename: string; Flags: TCopyFileFlags=[cffOverwriteFile]): boolean;
 function [[CopyFile]](const SrcFilename, DestFilename: string; PreserveTime: boolean): boolean;
 function CopyDirTree(const SourceDir, TargetDir: string; Flags: TCopyFileFlags=[]): Boolean; 
 
   //文件动作
 function ReadFileToString(const Filename: string): string;
 function GetTempFilename(const Directory, Prefix: string): string; inline; 
 
   //基本的函数，类似于RTL，但是使用UTF-8，而不是使用系统编码
   //AnsiToUTF8和UTF8ToAnsi在Linux、BSD、MacOSX下需要一个widestring管理器  
   //但是通常情况下，这些操作系统使用UTF-8作为系统编码，因此不需要widestring管理器。
 function NeedRTLAnsi: boolean; inline;// true，如果系统编码不是UTF-8
 function NeedRTLAnsi: boolean; inline;// true，如果系统编码不是UTF-8
 procedure SetNeedRTLAnsi(NewValue: boolean); inline;
 function UTF8ToSys(const s: string): string; inline;//像UTF8ToAnsi一样，但是更多的独立于widestring管理器
 function SysToUTF8(const s: string): string; inline;//像AnsiToUTF8一样，但是更多的独立于widestring管理器
 function ConsoleToUTF8(const s: string): string; inline;//转换OEM编码字符串到UTF8 (与一些Windows的特殊函数一起使用)
 function UTF8ToConsole(const s: string): string; inline;//转换UTF8字符串到控制台编码(由Write、WriteLn使用)
 
   // 文件操作
 function FileExistsUTF8(const Filename: string): boolean; inline;
 function FileAgeUTF8(const FileName: string): Longint; inline;
 function DirectoryExistsUTF8(const Directory: string): Boolean; inline;
 function ExpandFileNameUTF8(const FileName: string): string; inline;
 function ExpandUNCFileNameUTF8(const FileName: string): string;
 function ExtractShortPathNameUTF8(Const FileName : String) : String;
 function FindFirstUTF8(const Path: string; Attr: Longint; out Rslt: TSearchRec): Longint; inline;
 function FindNextUTF8(var Rslt: TSearchRec): Longint; inline;
 procedure FindCloseUTF8(var F: TSearchrec); inline;
 function FileSetDateUTF8(const FileName: String; Age: Longint): Longint; inline;
 function FileGetAttrUTF8(const FileName: String): Longint; inline;
 function FileSetAttrUTF8(const Filename: String; Attr: longint): Longint; inline;
 function DeleteFileUTF8(const FileName: String): Boolean; inline;
 function RenameFileUTF8(const OldName, NewName: String): Boolean; inline;
 function FileSearchUTF8(const Name, DirList : String; ImplicitCurrentDir : Boolean = True): String; inline;
 function FileIsReadOnlyUTF8(const FileName: String): Boolean; inline;
 function GetCurrentDirUTF8: String; inline;
 function SetCurrentDirUTF8(const NewDir: String): Boolean; inline;
 function CreateDirUTF8(const NewDir: String): Boolean; inline;
 function RemoveDirUTF8(const Dir: String): Boolean; inline;
 function ForceDirectoriesUTF8(const Dir: string): Boolean; inline;
 function FileOpenUTF8(Const FileName : string; Mode : Integer) : THandle; inline;
 function FileCreateUTF8(Const FileName : string) : THandle; overload; inline;
 function FileCreateUTF8(Const FileName : string; Rights: Cardinal) : THandle; overload; inline;  
 
   //环境
 function ParamStrUTF8(Param: Integer): string; inline;
 function GetEnvironmentStringUTF8(Index: Integer): string; inline;
 function GetEnvironmentVariableUTF8(const EnvVar: string): String; inline;
 function GetAppConfigDirUTF8(Global: Boolean; Create: boolean = false): string; inline;
 function GetAppConfigFileUTF8(Global: Boolean; SubDir: boolean = false; CreateDir: boolean = false): string; inline;  
 
   //其它
 function SysErrorMessageUTF8(ErrorCode: Integer): String; inline;