SHA(1)

NAME
sha - file hashing utility

SYNOPSIS

sha [-12345Vh] [file ...]

DESCRIPTION
sha is a simple program that hashes files. It uses the National Institute of Standards and Technology's Secure Hash Algorithm. It can use SHA-1, SHA-256, SHA-384, or SHA-512, which generate respectively, hashes of 160, 256, 384, or 512 bits. sha can be used in scripts to do, for example, file integrity checking.

OPTIONS

-1  Use SHA-1, which produces a 160-bit hash (40 hex digits).

-2  Use SHA-256, which produces a 256-bit hash (64 hex digits).

-3  Use SHA-384, which produces a 384-bit hash (96 hex digits).

-5  Use SHA-512, which produces a 512-bit hash (128 hex digits).

-V  Display version information.

-h  Display help summary.

file ...
    One or more files to hash. If no files are given, stdin is hashed.

If neither -1, -2, -3, or -5 are given, then SHA-1 is used. (But see note about SHA_DEFAULT below.)

ENVIRONMENT

SHA_DEFAULT
    The default hash algorithm to use. ``1'' denotes SHA-1, ``2'' denotes SHA-256, ``3'' denotes SHA-384, and ``5'' denotes SHA-512. Only the first character is significant. If not defined, SHA-1 is the default.