2006/3/7, David.Bauer at schering.de <David.Bauer at schering.de>: > What about this solution: > > cutseq foo.fasta -from 2 -to 2 | pasteseq -filter -pos 1 -bs asis:'L' | > descseq -filter -append -desc "A2L" Thanks a lot. It works very well! Best -- Zhiqiang Ye