GNU Parallel Bug Reports [Feature request] easily refer to the last column of input

[Thor Andreassen]

Hi,

I've been using GNU parallel for a while now and I like it a lot.

I came across a problem today, that, besides awk, would be a good fit
for GNU parallel. For example, given the following input (infile):

1 4 5 1
2 3 5 2
7 8 6 3

Add column 2 and the last column, not knowing how many columns there
will be, and append the result to the output.

The output in this case should be:

1 4 5 1 5
2 3 5 2 5
7 8 6 3 11

With my experience from perl arrays I hoped I could refer to the last
column with {-1}, e.g. with parallel and bash:

<infile parallel --colsep ' +' echo '{}' '$(( {2} + {-1} ))'

I've looked for the relevant bit in the source code, but so far I've
been unable to find it.

-- 
best regards
Thor Andreassen