First, thank you for your work. I use coreutils daily both for my research and teaching. It is a great set of tools.

Second, I recently needed to extract Coding Sequences information from a GenBank file. GenBank files are used in Computational Genomics/Bioinformatics extensively. I used csplit, and it works like a charm.

The command I used is:

csplit -sz -n 5 --prefix=02_ 01_00001 /[[:space:]][[:space:]][[:space:]][[:space:]][[:space:]]CDS[[:space:]][[:space:]][[:space:]][[:space:]][[:space:]][[:space:]][[:space:]][[:space:]][[:space:]][[:space:]][[:space:]][[:space:]][[:space:]]/ {*};

I was unable to declare: "[[:space:]]\+" as I expected for POSIX aware code.

My question is: Is csplit POSIX compatible? and if it is not, can we make it POSIX compatible?

Many Thanks

Rodolfo