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srf_index_hash(1)		 Staden	io_lib		     srf_index_hash(1)

NAME
       srf_index_hash -	Adds a hash-table index	to an SRF file.

SYNOPSIS
       srf_index_hash  [-c] srf_archive

DESCRIPTION
       srf_index_hash  adds  and  index	to an SRF file or replaces an existing
       index with a new	one. In	the case of concatenated SRF  files  only  the
       index  at the end of a file will	be replaced, but internal indices will
       not be consulted	by SRF tools.

       The index is a hash table indexing the sequence names  only.  The  name
       itself  does not	appear in the index, rather the	top 7-bits of a	64-bit
       hash key	are held in the	index along with N-bits	used to	determine  the
       hash  bucket. This reduces the index size to around 10-15 bytes per se-
       quence.

OPTIONS
       -c     Check only. This requests	that the index is  not	produced,  but
	      the  checks  performed  during the creation of an	index (such as
	      looking for duplicate sequence names) are	still performed.

AUTHOR
       James Bonfield, Wellcome	Trust Sanger Institute

				 September 29		     srf_index_hash(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | AUTHOR

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