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my $FileName = "jimbo";
my $t = ".tm";
...

my $fullFileName = $FileName . $t; # the . joins them together - calle
+d "concatenation" - do a PM search on this keyword
print $fullFileName; # prints 'jimbo.tm'

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unlink ($fullFileName) or die "Error! : $!\n"; 
# die statements will kill the program if an error is encountered.
# the error msg is contained in $! special variable and is printed
# on exit