[tpm] Pipe expression result through external filter command

Antonio Sun antoniosun at lavabit.com
Mon May 14 10:29:47 PDT 2012

On Mon, May 14, 2012 at 12:06 PM, Antonio Sun <antoniosun at lavabit.com>wrote:

> I need to calculate 12+34, then pipe this expression result through an
> external shell filter command, say 'rev'.
> ultimately, I'm going to use the whole expression in the second part of
> string replace 's/.../.../eg' operation.

Maybe I have to do it in two steps:

 perl -e '$str = "1234"; $str =~ s/1234/$var = $&; `echo $var | rev`/e;
print $str'

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