I just want to mention, since it sounds like you are a beginner in Perl, that the method given by ysth will overwrite the contents of your file. If you want to append to a file, you need to open the file as
open my $handle, ">> filename" or die "Couldn't open file: $!";
Note the ">>" instead of ">".
You can print anything else to the file using
print $handle "Hello, world\n";
print $handle $some_other_var;
until the close
command is executed on $handle.
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