08-23-2012
Thank you for your help. However, the tab indentations in the file is getting removed by both of your awk and perl suggestions !! Any idea how to get rid of it?
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LEARN ABOUT DEBIAN
bio::seqio::tab
Bio::SeqIO::tab(3pm) User Contributed Perl Documentation Bio::SeqIO::tab(3pm)
NAME
Bio::SeqIO::tab - nearly raw sequence file input/output stream. Reads/writes id" "sequence"
"
SYNOPSIS
Do not use this module directly. Use it via the Bio::SeqIO class.
DESCRIPTION
This object can transform Bio::Seq objects to and from tabbed flat file databases.
It is very useful when doing large scale stuff using the Unix command line utilities (grep, sort, awk, sed, split, you name it). Imagine
that you have a format converter 'seqconvert' along the following lines:
my $in = Bio::SeqIO->newFh(-fh => *STDIN , '-format' => $from);
my $out = Bio::SeqIO->newFh(-fh=> *STDOUT, '-format' => $to);
print $out $_ while <$in>;
then you can very easily filter sequence files for duplicates as:
$ seqconvert < foo.fa -from fasta -to tab | sort -u |
seqconvert -from tab -to fasta > foo-unique.fa
Or grep [-v] for certain sequences with:
$ seqconvert < foo.fa -from fasta -to tab | grep -v '^S[a-z]*control' |
seqconvert -from tab -to fasta > foo-without-controls.fa
Or chop up a huge file with sequences into smaller chunks with:
$ seqconvert < all.fa -from fasta -to tab | split -l 10 - chunk-
$ for i in chunk-*; do seqconvert -from tab -to fasta < $i > $i.fa; done
# (this creates files chunk-aa.fa, chunk-ab.fa, ..., each containing 10
# sequences)
FEEDBACK
Mailing Lists
User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to one
of the Bioperl mailing lists. Your participation is much appreciated.
bioperl-l@bioperl.org - General discussion
http://bioperl.org/wiki/Mailing_lists - About the mailing lists
Support
Please direct usage questions or support issues to the mailing list:
bioperl-l@bioperl.org
rather than to the module maintainer directly. Many experienced and reponsive experts will be able look at the problem and quickly address
it. Please include a thorough description of the problem with code and data examples if at all possible.
Reporting Bugs
Report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution. Bug reports can be submitted via the
web:
https://redmine.open-bio.org/projects/bioperl/
AUTHORS
Philip Lijnzaad, p.lijnzaad@med.uu.nl
APPENDIX
The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
next_seq
Title : next_seq
Usage : $seq = $stream->next_seq()
Function: returns the next sequence in the stream
Returns : Bio::Seq object
Args :
write_seq
Title : write_seq
Usage : $stream->write_seq($seq)
Function: writes the $seq object into the stream
Returns : 1 for success and 0 for error
Args : Bio::Seq object
perl v5.14.2 2012-03-02 Bio::SeqIO::tab(3pm)