Opening files and using file handles: open(filehandle, name); : Open file « File « Perl






  1. Perl
  2. File
  3. Open file

Opening files and using file handles: open(filehandle, name);

    

It's conventional to use uppercase names for file handles.
The name is the name of the file, along with some special codes for the particular mode you want to use when you open the file.
The special codes used with the file names and determine whether the file will open for reading or writing.

File Name        Meaning
<filename        Open file for input.
+<filename       Open file for input and output.
+>filename       Open file for input and output, truncate existing data.
filename         Open file for input.
>filename        Open file for output, truncate existing data.
>>filename       Open file for output, append to end of existing data.








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4.To open a file for writing
5.open (FILEHANDLE, "<&FILEHANDLE2");
6.open (FILEHANDLE2, "<&=FILEHANDLE");
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14.Open command expressions
15.Open file for update
16.Open file for writing
17.Open file reading
18.Open for Appending
19.Open for Reading
20.Open for Reading and Writing
21.Open for Writing
22.Open for writing first, then reading
23.Opening an input filter on a Win32 platform
24.Opens two files and copies one into another.
25.Checks whether an unopened file actually exists.
26.Input Filter: open(FILEHANDLE, COMMAND|);
27.Sending the Output of a Filter to a File: open(STDOUT, ">/dev/tty");
28.Uses die when testing for a successful file open operation.
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