val:1 5.50
this line has 6.70
this one, even more, fields 10.15
Using awk you refer to the last column with $NF. So after saving the file we can save the result ina variable
:let @a = system("awk '{t+=$NF} END {print t}' file.txt")
Now we insert the value with:
:put a
Or on insert mode
<Ctrl-r>a
A more simple solution
:r!awk '{t+=$NF} END {print "Total: " t}' %
:r ................... read to next line
awk .................. awk command
t ................... variable to store total
$NF .................. last field
% .................... current file
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