Those files can be handled with the Unix 'uncompress' program, or programs such as the PC and Mac utilities described below. Installed, one possible place for obtaining gzip is: įiles with a *.Z extension have been compressed by the UNIX 'compress' program. If you are unsure about the availability of gzip for your platform, pleaseĬontact your system administrator. The gzip utility is used to compress various other data on the ftp site as well. The suffix of compressed GenBank data files was previously '.Z'. Of disk space, and reduces the amount of bandwidth utilized by those whoĪs a result of the switch to gzip, file naming conventions have changed. GenBank data NCBI distributes, switching to gzip saves a great deal Given that ESTs and GSS sequences comprise a huge portion of the GenBank files, starting with GenBank Release 119.0.Ĭomparisons of gzip to compress for simplistic sequence data (e.g., EST, GSS, STS) yielded an additional 50% reduction in the size of a compressed file. Gzip compression utility instead of the Unix 'compress' utility for all This document describes how both file types can be uncompressed.Īs announced via the GenBank newsgroup on June 15, 2000, NCBI now uses the The 'gzip' program (and have the extension *.gz), or the UNIX 'compress' program (and have the extension *.Z). The human genome, whole genomes and related resourcesįiles available from the NCBI anonymous FTP site have been compressed using An introduction for researchers, educators and the public.

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