NAME

       bammarkduplicates2 - mark duplicate reads/alignments in BAM files

SYNOPSIS

       bammarkduplicates2 [options]

DESCRIPTION

       bammarkduplicates2 reads a coordinate sorted BAM file containing alignments computed by an aligner, marks
       duplicate reads/alignments using the coordinates of the alignments and writes the marked alignments to  a
       BAM  file. By default input is via standard input and output via standard output. Duplication metrics are
       provided on the standard error channel by default. bammarkduplicates2 scans the input BAM file twice,  it
       is thus of benefit to set the I key (described below) to give the name of an input file. If the input BAM
       file is given via standard input, then a copy of the input will be stored in a temporary file during  the
       first  run for processing in a second run. bammarkduplicates2 assumes that each read end of a pair occurs
       in exactly one entry in the file.

       The following key=value pairs can be given:

       I=<stdin>: name of the input file (input is read from standard input if not set). This key can  be  given
       multiple  times.  If it is given multiple times, then all the input files need to be in coordinate sorted
       order and will be merged for output such that the output will be coordinate sorted.

       O=<stdout>: name of the output file (output is written to standard output if not set)

       M=<stderr>: name of the metrics file (metrics are written to standard error if not set)

       tmpfile=<filename>: prefix for temporary files. By default the temporary files are created in the current
       directory

       level=<-1|0|1|9|11>: set compression level of the output BAM file. Valid values are

       -1:    zlib/gzip default compression level

       0:     uncompressed

       1:     zlib/gzip level 1 (fast) compression

       9:     zlib/gzip level 9 (best) compression

       If libmaus has been compiled with support for igzip (see https://software.intel.com/en-us/articles/igzip-
       a-high-performance-deflate-compressor-with-optimizations-for-genomic-data) then an additional valid value
       is

       11:    igzip compression

       markthreads=<1>: Number of threads used during marking duplicate alignments.

       verbose=<1>: Valid values are

       1:     print progress report on standard error

       0:     do not print progress report

       mod=<1048576>: print progress after processing every mod'th input read/alignment (default is 1M)

       rewritebam=<0|1|2>:  compression  type  of  the temporary file stored if I key is not given (input is via
       standard input). Valid values are

       0:     temporary data is compressed using snappy (if available, see http://code.google.com/p/snappy/)

       1:     gzip/BAM, recompress input and store it as a BAM file

       2:     copy, produce a 1/1 copy of the input stream as a temporary file

       rewritebamlevel=<-1|0|1|9|11>: compression level of temporary BAM file if rewritebam is 1 (see level  key
       for possible values).

       colhashbits=<20>:  base two logarithm of the size of the hash table used for collation (the default value
       is 18 and should work reasonably  well  for  most  input  files.   Please  see  the  biobambam  paper  at
       arxiv.org/abs/1306.0836 for details).

       collistsize=<33554432>:  size  of hash table overflow list in bytes (the default is 128MB and should work
       reasonably well for most input files. Please see  the  biobambam  paper  at  arxiv.org/abs/1306.0836  for
       details).

       fragbufsize=<50331648>: size of each fragment/pair file buffer in bytes (bammarkduplicates2 uses two such
       buffer for detecting duplicates)

       rmdup=<0|1>: sets how duplicates are handled

       0:     duplicates will be retained in the output file and have the duplication flag set

       1:     duplicates will be remove when writing the output file

       maxreadlength=<[500]>: maximum read length in input. This value can be set higher than the actual maximum
       in the file but not lower.

       md5=<0|1>: md5 checksum creation for output file. Valid values are

       0:     do not compute checksum. This is the default.

       1:     compute  checksum.  If the md5filename key is set, then the checksum is written to the given file.
              If the md5filename key is not given but set O key is set the checksum will be  written  as  output
              file name with .md5 appended.  If md5filename and O are unset, then no checksum will be computed.

       md5filename file name for md5 checksum if md5=1.

       index=<0|1>: compute BAM index for output file. Valid values are

       0:     do not compute BAM index. This is the default.

       1:     compute  BAM  index.  If  the indexfilename key is set, then the BAM index is written to the given
              file. If the indexfilename key is not given but set O key is set the checksum will be  written  as
              output  file name with .bai appended.  If indexfilename and O are unset, then no BAM index will be
              computed.

       indexfilename file name for BAM index if index=1.

       tag=<tag> name of auxiliary field storing tag information in string form. Read fragments  or  pairs  with
       different  tags  will  not  be  considered  as  duplicates, even they would be according to their mapping
       coordinates. For pairs the tag field information of the first and second mate are concatenated to  obtain
       the tag of the pair.

       nucltag=<tag>  this option works like the tag option but is restricted to sequences of nucleotides (A,C,G
       or T) as tags. The length of each tag sequence is not allowed to exceed 15 bases. All tags  are  required
       to  have  the  same  length.   Each non nucleotide symbol is mapped to A. In constrast to the tag option,
       nucltag uses less memory for processing and can be expected to be faster.

       D ouptut file name for removed duplicates if rmdup=1. By default the  reads  and  read  pairs  marked  as
       duplicates  are  discarded  when  rmdup=1.  If  the D key is set, then the sequence of reads which is not
       written to the output file is written to a separate file. The name of this separate file is the value  of
       the D key.

       dupmd5=<0|1>:  compute  md5  checksum  of  file  given by D key if rmdup=1. By default no md5 checksum is
       computed for this file.

       dupmd5filename: file name for storing the md5 checksum of the D file if rmdup=1, D is set and dupmd5=1.

       dupindex=<0|1>: compute BAM index for file given by D key if rmdup=1. By default no index is compute  for
       this file.

       dupindexfilename: file name for storing the BAM index of the D file if rmdup=1, D is set and dupmd5=1.

       optminpixeldif=<100>:  distance  (x  and y inside same tile) inside which reads are considered as optical
       duplicates

AUTHOR

       Written by German Tischler.

REPORTING BUGS

       Report bugs to <tischler@mpi-cbg.de>

COPYRIGHT

       Copyright © 2009-2013 German Tischler, © 2011-2013 Genome Research  Limited.   License  GPLv3+:  GNU  GPL
       version 3 <http://gnu.org/licenses/gpl.html>
       This  is  free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent
       permitted by law.