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does the system command allow to capture the output of it? Eventually I would like to subtract the values: y-x in the script. This script, obviously, does not work:

BEGIN {
system("date +%s") |...

I am trying to get the ellapsed time in seconds in the body of the awk script. I use unix date to get the time. It works in BEGIN {} but not in the body {} of awk. Any ideas?

$ cat a
BEGIN {
...