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File Modes

• r    – read mode (the default)
• w   – write mode
• a    – append mode
• r+  – update mode, all previous data is preserved
• w+– update mode, all previous data is erased
• a+ – append update mode, previous data is preserved, writing is only allowed at the end of file

File Functions

• file.open()  – Open a file (Create a new file when write mode)
  • file.open(filename, mode)
    • Eg : file.open(“New_File”, “r”)
    • returns nil if file not open, else file opened returns true
• file.remove() – Remove a file.
  • file.remove(filename)
    • Eg: file.remove(“New_File”)
    • return nil (nothing)
• file.rename() – Rename the file.
  • file.rename(oldname, newname)
    • Eg: file.rename(“Old_File”, “New_File”)
    • return true if success, false if error.

Create a New file

• file.open(“File_Name”, “Mode”) 

File – Hello world Program

file.open("hello/world.txt", "w")
file.writeline("Hello World!")                                                
file.close()

 

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