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perl -l -n -e 'BEGIN{$sum=0;} $sum=$sum+ $1 if /(\d+)/;print $1; END {
+print "Total: ",$sum}'

echo -e "a\nb\nc" | perl -lne 'next if /b/; print'
a
c
echo -e "a\nb\nc" | perl -lne 'last if /b/; print'
a

perl -lne 'print $s += $1 if /(\d+)/'