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If your version of tar can read from stdin, you can do something like this to avoid storing hundreds upon hundreds of gigabytes of temporary files:



# create tapes
mkfifo tarfifo
tar -vcf...

You only get to do bs=...G if you have GNU dd.

Advertised tape sizes are very often inflated. We don't know his tapes actually are 600GB, i.e. whether that means real gigabytes or drivemaker's...

Haven't thought of using dd to tell the truth.
But that's really tough to understand.

Can I propose

dd if=bigfile of=/dev/tape bs=600GB count=1 skip=0

and increase skip by one each...

the following works for me, though you may have to modify it to your specific needs (open the file directly, allow for spaces at the start of the record and other sanity checks etc...

#!...

Something like this?
awk '!n{n=$NF}($NF>=n){print;n=$NF}/#/{print;n=0}' file