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use strict;
use warnings;
...
    sleep 1;
    return "hello:" . $_[0];
}

total 20
drwxrwxr-x   2 andrew andrew 4096 Sep  3 14:44 ./
...
-rw-rw-r--   1 andrew andrew  191 Sep  3 14:42 fred.tmp.bak
drwxrwxr-x  11 andrew andrew 4096 Sep  3 14:42 ../
-rw-rw-r--   1 andrew andrew  288 Sep  3 14:41 tsitu1.pl