A somewhat different way of doing it:
perl -lne 's[\A\s+][]; s[\s+\Z][]; $last=pop [split /\s+/] if $_; END
+{ print $last }' scan.log
- -l auto-chomps
- -n wraps the code in a while(<>){ ... }
- The substitutions remove leading and trailing blanks
- The split extracts the words in the line (whitespace-separated)
- The pop takes the last word
- We save this for each line
- At end of file, we print the current last word, which will be from the last line
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