Re: perl onliner on multiple files

This (untested) may do what you want:

perl -nE"/: / and $c+= (split/: /)[0]; if( eof(ARGV) ){ say qq[SUM.$AR
+V =$c]; $c=0 }" tmp_*
[download]

-n:
provides the while(<>){} loop.
the if( eof(ARGV) )
checks for the end of each individual file, prints the results and resets $c to 0.
$ARGV:
gives you the names of the individual files in the output.

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