descseq reads a sequence and writes it to file but with a different name and / or description. All other records including the sequence itself are left unaltered.
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Most sequence formats allow, at the very minimum, a name for the sequence and some comments to be stored in the sequence file. descseq let's you change the sequence name and / or description, and is far more convenient and less error-prone than using the editor for editing.
The default action is to replace the existing name or description with your new one, but by using the qualifier -append what you enter is appended to the existing name or description. Note that if you append to a description, no space is inserted by default bewteen the existing description and your appended text. You have to put in a space yourself if you require one.