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-v OFS='\t' works great (not FS='\t')

but if(!match(/noatime/, $4)) doesn't seem to work. I get:
proc /proc proc defaults,noatime,noatime 0 0

This really good. 3 questions:
1) why does this seems to mess up white space? I think my original fstab is tab delimted, hte result is space delimited
2) what does the 1 do at the end of the awk...

I need as script (awk/sed?) to add noatime option to fstab.
It should append ,noatime to whatever is in column 4 if noatime isn't already there, leaving comments alone.

input:
# /etc/fstab
#...