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Perl loop until

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# 1  
Old 07-24-2014
Perl loop until
I have a script that needs to wait on another script to finish. I created a sub routine to check the file for the number 0 but my until statement keeps on going. I tried eq, == and =~ but same thing.
Code:
 my $CHECKING_FILE = 1;
 do {
      sleep(5);
      $CHECKING_FILE = check_file();
      print "CHECKING sub is $CHECKING_FILE\n";
      } until ($CHECKING_FILE == 0);
 
sub check_file {
 open PROCESS, "< process.txt" or die $!;
     my $CHECK = <PROCESS>;
 close PROCESS;
print "$CHECK\n";
return $CHECK
 }

I put some print lines in to show me the outputs. The output shows me that the sub routine returned a 0, but the loop will not break.
Code:
 1
CHECKING sub is 1
1
CHECKING sub is 1
1
CHECKING sub is 1
1
CHECKING sub is 1
1
CHECKING sub is 1
1
CHECKING sub is 1
1
CHECKING sub is 1
1
CHECKING sub is 1
1
CHECKING sub is 1
0
CHECKING sub is 0
0
CHECKING sub is 0

# 2  
Old 07-24-2014
This code seems to work fine for me, are you sure you don't have some sort of non-printable in the process.txt file?

Post output of od -c process.txt
# 3  
Old 07-24-2014
You are right, it does work!
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