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Top Forums UNIX for Beginners Questions & Answers Assistance required to decode sed search using /1 Post 303035611 by sand1234 on Wednesday 29th of May 2019 10:07:19 AM
Old 05-29-2019
Assistance required to decode sed search using /1

Hi,

I am trying to extract line number (first number), as well as everything from TSVal onwards.

Code:
 4   1.474005 172.18.124.142 -> 74.125.228.46 TCP 2450940617 74 44021 > https [SYN] Seq=0 Win=5840 Len=0 MSS=1380 SACK_PERM=1 TSval=2450940617 TSecr=0 WS=64
  6   1.488149 172.18.124.142 -> 74.125.228.46 TCP 2450940637 66 44021 > https [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSval=2450940637 TSecr=1834617706

The following sed regex accomplishes this, but I have a few questions around the expression.

Code:
$ cat tcp_timestamps.txt | sed 's/\([0-9]\) .*TSval/\1 TSval/'
 4 TSval=2450940617 TSecr=0 WS=64
  6 TSval=2450940637 TSecr=1834617706

1> Why does [0-9] need to be grouped into brackers?
2> What is the purpose of \1 TSval? If /1 denotes the last element which is remembered, how does it apply here?

Thanks,
 

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Bio::Seq::SeqFastaSpeedFactory(3pm)			User Contributed Perl Documentation		       Bio::Seq::SeqFastaSpeedFactory(3pm)

NAME
Bio::Seq::SeqFastaSpeedFactory - Instantiates a new Bio::PrimarySeqI (or derived class) through a factory SYNOPSIS
use Bio::Seq::SeqFastaSpeedFactory; my $factory = Bio::Seq::SeqFastaSpeedFactory->new(); my $seq = $factory->create(-seq => 'WYRAVLC', -id => 'name'); # If you want the factory to create Bio::Seq objects instead # of the default Bio::PrimarySeq objects, use the -type parameter: my $factory = Bio::Seq::SeqFastaSpeedFactory->new(-type => 'Bio::Seq'); DESCRIPTION
This object will build Bio::Seq objects generically. 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 the Bioperl mailing list. 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 of the bugs and their resolution. Bug reports can be submitted via the web: https://redmine.open-bio.org/projects/bioperl/ AUTHOR - Jason Stajich Email jason@bioperl.org APPENDIX
The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _ new Title : new Usage : my $obj = Bio::Seq::SeqFastaSpeedFactory->new(); Function: Builds a new Bio::Seq::SeqFastaSpeedFactory object Returns : Bio::Seq::SeqFastaSpeedFactory Args : -type => string, name of a PrimarySeqI derived class This is optional. Default=Bio::PrimarySeq. create Title : create Usage : my $seq = $seqbuilder->create(-seq => 'CAGT', -id => 'name'); Function: Instantiates a new Bio::Seq object, correctly built but very fast, knowing stuff about Bio::PrimarySeq and Bio::Seq Returns : Bio::Seq Args : initialization parameters specific to the type of sequence object we want. Typically -seq => $str, -id => $name perl v5.14.2 2012-03-02 Bio::Seq::SeqFastaSpeedFactory(3pm)
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