使用bash脚本从字母数字文本文件中检索数字

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.I am outputting the results of a timed executab