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srf_index_hash - Online in the Cloud

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This is the command srf_index_hash that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

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 sequence.

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.

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