On Wednesday 19 May 2004, austin at slide-recordings.com (austin) wrote:
>Hi Folks,
>>Just wondering if anyone can give me a quick solution to a pretty
>straightforward problem. I have a text file of DNA sequences. Each sequence
>has at the top a header
>>>Unique Identifier blah blah blah
>sequence
>>The unique identifier is 4 letters and 3 numbers. Basically i want to parse
>the file and append it with some extra info ie
>>>Unique Identifier NEW TEXT blah blah blah
>sequence
>>the new text i want to insert is one number and 5 letters and is exactly the
>same in each. I am assuming that i can use something straightforward on the
>command line to do this but, possibly due to it being early in the morning
>and not having had enough coffee, I cant seem to figure anything out. If
>anyone has any ideas they would be hugely appreciated as I need to try and
>sort this problem out asap.
sed or perl (or vi or emacs) will do the trick. But before giving a specific
answer, you need to state the problem more specifically. Can you state with
certainty that ONLY header lines will begin with 4 letters and 3 numbers (it
has to be possible to identify the header lines somehow) ? Is NEW TEXT the
same for every header or does it depend on the header?
Niall
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