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awk on the CLI
me@banshee:~
$ cat file
1.1 2.2 3.3 4.4 1.1 2.2 3.3 4.4 1.1 2.2 3.3 4.4 1.1 2.2 3.3 4.4
me@banshee:~
$ cat file | awk ‘{mysum += $3} END {print mysum}’
13.2