File command
From Just Solve the File Format Problem
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The file command is a file format identification utility that has been a part of Unix distributions for many years.
The Debian manpage gives an overview of its functionality
The program source includes a database of heuristics for determining file types, which includes a variety of 'magic numbers' which characterise files. This database is not portable, but is potentially adaptable.
Links
- File Command web site
- Source code
- FreeBSD port tree (referring to the porting of the original distribution into FreeBSD)
