Retrieving numbers from an alphanumeric text file using a bash script

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http://stackoverflow.com – I am outputting the results of a timed executable to a file that has run 10 times. I have all the times in a file, and I need to find the best, worst, and average user times from this file. I was thinking about using a combination of awk to print the first column, but I am unsure how to strip "user" from the line so I can sort it numerically. Also, I would need to get rid of the even rows, since they have information about the inputs and outputs and things that don't matter to these calculations. A sample of the time file is below: 1.12user 0.00system 0:01.12elapsed 99%CPU (0avgtext+0avgdata (HowTos)