01-15-2015
Your reply reminds me of two ideas that bug me a lot, or I have been trying to catch to handle fasta files. 1) Use some sort of index (hashing? FM-index?); 2) use suffix array, tree or trie to do the job. I'm trying to get example code by starting from what I have.
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LEARN ABOUT DEBIAN
apt-sortpkgs
APT-SORTPKGS(1) APT APT-SORTPKGS(1)
NAME
apt-sortpkgs - Utility to sort package index files
SYNOPSIS
apt-sortpkgs [-s] [-o=config_string] [-c=config_file] filename... {-v | --version} {-h | --help}
DESCRIPTION
apt-sortpkgs will take an index file (source index or package index) and sort the records so that they are ordered by the package name. It
will also sort the internal fields of each record according to the internal sorting rules.
All output is sent to standard output; the input must be a seekable file.
OPTIONS
All command line options may be set using the configuration file, the descriptions indicate the configuration option to set. For boolean
options you can override the config file by using something like -f-,--no-f, -f=no or several other variations.
-s, --source
Use source index field ordering. Configuration Item: APT::SortPkgs::Source.
-h, --help
Show a short usage summary.
-v, --version
Show the program version.
-c, --config-file
Configuration File; Specify a configuration file to use. The program will read the default configuration file and then this
configuration file. If configuration settings need to be set before the default configuration files are parsed specify a file with the
APT_CONFIG environment variable. See apt.conf(5) for syntax information.
-o, --option
Set a Configuration Option; This will set an arbitrary configuration option. The syntax is -o Foo::Bar=bar. -o and --option can be
used multiple times to set different options.
SEE ALSO
apt.conf(5)
DIAGNOSTICS
apt-sortpkgs returns zero on normal operation, decimal 100 on error.
BUGS
APT bug page[1]. If you wish to report a bug in APT, please see /usr/share/doc/debian/bug-reporting.txt or the reportbug(1) command.
AUTHORS
Jason Gunthorpe
APT team
NOTES
1. APT bug page
http://bugs.debian.org/src:apt
APT 0.9.7.9 09 June 2012 APT-SORTPKGS(1)