Changes

# http://spin.niddk.nih.gov/NMRPipe/doc/nmrProg/showApod.html

# https://groups.yahoo.com/neo/groups/nmrpipe/conversations/messages/2382

showApod test.ft2 | grep "REMARK Automated Noise Std Dev in Processed Data:" | awk '{print $9} '

This will print two numbers, first is noise estimate for the spectrum, second is noise estimate for the time-domain ... try it without the "-noverb" option to see more info.