Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

Re: Sequentially numbering output files rather than overwriting an existing file

by duelafn (Vicar)
on Jan 09, 2014 at 00:46 UTC ( #1069890=note: print w/replies, xml ) Need Help??


in reply to Sequentially numbering output files rather than overwriting an existing file

If you don't want to risk races, use sysopen and loop until you can create the file yourself:

#!/usr/bin/perl -w use strict; use warnings; use 5.010; use Fcntl qw/ O_CREAT O_EXCL O_WRONLY /; my $fh = open_next( "Results", ".txt" ); print $fh "Hello!\n"; sub open_next { my ($prefix, $suffix) = @_; my $number = 0; my $FH; until (sysopen($FH, ($prefix . ($number || "") .$suffix), O_WRONLY +|O_EXCL|O_CREAT)) { $number++; } return $FH; }

Good Day,
    Dean

  • Comment on Re: Sequentially numbering output files rather than overwriting an existing file
  • Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1069890]
help
Chatterbox?
and the monks are chillaxin'...

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (5)
As of 2017-02-19 18:53 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Before electricity was invented, what was the Electric Eel called?






    Results (293 votes). Check out past polls.