Ruby File Operations

Read an object and print it out:

 
Lines = file. open ('dom. js '). readlinesputs "=================================" lines. each {| Line | puts (line )}
 

Or:

 
File. Open ("dom. js") Do | file | while line = file. Gets puts line endend
 

The latter ensures that the file is closed after it is used up.

Append content to the target file:

 
File = file. Open ("dom. js", "A") file. Puts "// This is new content." file. Close
 

But sometimes this may not add Chinese content, reported "invalid multibyte char (US-ASCII)" error, we will add such a comment on the top of the current script, it will be okay, that is

 
# Coding: UTF-8 file = file. Open ("dom. js", "A") file. Puts "// This is the newly appended content." file. Close
 

Create a new file and add content to it.

 # Coding: UTF-8 file = file. new ("new_file.js", "W"); file 
 file rename: 
 
 # Coding: UTF-8 file. rename ("new_file.js", "New. JS ") 
 
 file rename: 
 
# coding: UTF-8 file. rename ("new_file.js", "New. JS ") # original file name, new file name 
 
 delete file 
 
 # Coding: UTF-8 file. delete ("New. JS ") # original file name 
 
 directory operation: 
 
 # Coding: UTF-8 dir. mkdir ("new") # create a new folder dir. rmdir ("new") # delete a specified folder 
 
 copy an object to the target Folder: 
 
 require 'fileutils' fileutils. CP 'new. js', 'new' 
 
 move a file to the target: 
 
 require 'fileutils' fileutils. MV 'new. js', 'new' 
 
 http://www.kuqin.com/rubycndocument/man/addlib/fileutils.html