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$ perl -nE "/: / and $c += (split/: /)[0]; if( eof(ARGV) ){ say qq[SUM
+.$ARGV =$c]; $c=0 }" tmp_*
syntax error at -e line 1, near "+="
syntax error at -e line 1, near "; ="
Execution of -e aborted due to compilation errors.

$ c=10
$ echo c
...
The total is: 10
$ echo 'The total is: $c'
The total is: $c