Better to use fileno to test filehandles as a filehandle can be defined and closed: 

$ perl -le'
print defined $FH ? "defined" : "not defined";       
print fileno $FH ? "open" : "not open";              
open my $FH, "<", "test.txt" or die "test.txt: $!";
print defined $FH ? "defined" : "not defined";
print fileno $FH ? "open" : "not open";        
close $FH;                                     
print defined $FH ? "defined" : "not defined"; 
print fileno $FH ? "open" : "not open";
'
not defined
not open
defined
open
defined
not open

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In reply to Re^4: Only last record is written to the output file instead of all records by jwkrahn
in thread Only last record is written to the output file instead of all records by valavanp

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