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@node Invoking guix hash
@section Invoking @command{guix hash}
The @command{guix hash} command allows to check the integrity of a file.
It is primarily a convenience tool for anyone contributing to the
distribution: it computes the cryptographic hash of a file, which can be
used in the definition of a package (@pxref{Defining Packages}).

The general syntax is:

@example 
 guix hash @var{option} @var{file}
@end example

@command{guix hash} has the following option:

@table @code
@item --format=@var{fmt}
@itemx -f @var{fmt}
Write the hash in the given format.

Supported formats: @code{nix-base32}, @code{base32}, @code{base16}
(@code{hex} and @code{hexadecimal} can be used as well).

If the @option{--format} option is not specified, @command{guix hash}
will output the hash in @code{nix-base32}.  This representation is used
in the definitions of packages.

@end table


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