Nodejs A concise summary of common functions of the file Operation module FS (Files System)

There are quite a few functions related to the system operation. Can be divided into two major categories first.

The class is asynchronous + callback. The class is synchronous.

In this case only the asynchronous collation, synchronous only need to add the function name after the sync

1. The first is a class of the most conventional read-write functions, function names and forms, should be originated in the C language.

Fs.open (file path, read/write ID, [file mode value, 666], callback function (err, file handle fd));          Fs.read (file handle FD, written by Buffer,offset,length,position, callback function (err, bytesread, buffer));          Fs.write (file handle FD, read Buffer,offset,length,position, callback function (Err,byteswritten,buffer));          Fs.close (file handle, callback function)          fs.truncate (file handle, truncation length, callback function);          Fs.fsync (file handle, callback function);

2. Read and write directly to the file, it is more convenient to use.

Fs.readfile (file name, encoding, callback function (Err,data));       Fs.writefile (file name, data, encoding, callback function (err));       Fs.appendfile (file name, data, encoding, callback function (err));

　　

3. Other common file operations

Determine if the file exists      fs.exists (file path, callback (presence));      Rename      fs.rename (old filename, new file name, callback function);      File owner Change      fs.chown (filename, Uid,gid, callback function),/fs.fchown (file handle Fd,uid,gid, callback function),/fs.lchown (link path, Uid,gid, callback function)      ; File permission change      fs.chmod (filename, mode, callback function),/fs.fchmod (file handle, mode, callback function),/fs.lchmod (link path, mode, callback function      ); File Information      fs.stat (file path, callback function (Err.fs.Stats object)),/fs.fstat (file handle FD, callback function (Err.fs.Stats object)),/fs.lstat (link path, callback function ( Err.fs.Stats object));      File time      fs.utimes (file path, access time, new time, callback function);/fs.futimes (file handle, access time, new time, callback function);      Monitor file      fs.watchfile (file name, [Options],listener_callback (Stats of current file, stats before change));      

　　

4. Directory Operations

Fs.mkdir (path, permission mode/777, callback function);    Fs.rmdir (path, callback function);    Fs.readdir (Path, callback function (Err,filenamearray));

　　

5. Link file operations

Create a link   fs.link (srcpath, Dstpath, [callback])   fs.symlink (destination, path, [type], [callback])   Read the link to the path   fs.readlink (path, [Callback (ERR,LINKSTR)])   Fs.unlink (Path,[callback]);

　　

Nodejs A concise summary of common functions of the file Operation module FS (Files System)