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Perfect! Many thanks!

awk ' ( NF == 5 ) && ( /^\./ ) { gsub(/[0-1][0-9][0-3][0-9][0-9][0-9][0-2][0-9][E][DS][T]/, dateblock synoptime tz, $4) ; print } 1' dateblock=$(date +%m%d%y) tz=$(date +%Z)...

I have been unable to find documentation to tell me how that works exactly -- it seems to print the entire file as well as the changed lines. I can get rid of the duplicates with uniq, but since I...

OK, that helped -- thanks!

I was under the impression that gsub would make the substitutions in the matching lines in the input file itself, but that the output would contain both the changed and...

I defined dateblock earlier in the program, before the awk statement. Unfortunately, the desired hour number is not just system time, but one of (02, 08, 14, 20) under EDT and (01, 07, 13, 19) under...

I have a file ("modtest") in which I want to update the last date/time block in the lines beginning with a period. Here is a sample:


.ROMULT 10150908EDT 10270908EDT 10010908EDT RANGE
RAWV2 ...