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chmod +s my_program_name.pl

chown my_user_name my_program_name.pl

($<,$>)=($>,$<);   # Swap effective and actual user ID
open(FILE, ">>/tmp/myfile") or die "Can't open /tmp/myfile";
print FILE "stuff";
close(FILE);
($>,$<)=($<,$>);   # Swap effective and actual user ID