HOW TO - Saving files without closing filehandles 1

[kudithipudi]

Hello Guys,
During the process of running my scripts/programs I usually open a bunch of file handles to write or read data to. I usually open the filehandle for log files at the starting of the program and close them at the end. Sometimes the script may error out or die unexpectadly. As a result all the logs I have written prior to the crash are lost. Is there any way to commit the data sent to the file handle to be explicitly written to disk rather than wait till the close(FILEHANDLE) is issued?

Thanks for the help..

- V.

 

[justice41]

Unbuffer the output of the filehandle that you are writting to. This will allow the script to write to the file in 'real-time'. An idiosyncratic way to do this is (do this just after you open() the filehandle):

select( (select(FILEHANDLE), $|++)[0] );

A more standard way is

my $oldfh = select(FILEHANDLE);
$| = 1;
select($oldfh);

jaa