TH SUM 1
SH NAME
sum, md5sum, sha1sum \- sum and count blocks in a file
SH SYNOPSIS
B sum
[
B -5r
]
[
I file ...
]
PP
B md5sum
[
I file ...
]
PP
B sha1sum
[
I file ...
]
SH DESCRIPTION
By default,
I sum
calculates and prints a 32-bit hexadecimal checksum,
a byte count,
and the name of
each
IR file .
The checksum is also a function of the input length.
If no files are given,
the standard input is
summed.
Other summing algorithms are available.
The options are
TP
B -r
Sum with the algorithm of System V's
B "sum -r"
and print the length (in 1K blocks) of the input.
TP
B -5
Sum with System V's default algorithm
and print the length (in 512-byte blocks) of the input.
PP
I Sum
is typically used to look for bad spots,
to validate a file communicated over
some transmission line or
as a quick way to determine if two files on different machines might be the same.
PP
B Md5sum
computes the 32 hex digit RSA Data Security, Inc. MD5 Message-Digest Algorithm
described in RFC1321.
If no
I files
are given,
the standard input is
summed.
PP
B Sha1sum
computes the 40 hex digit National Institute of Standards and Technology SHA1 secure hash algorithm
described in FIPS PUB 180-1.
If no
I files
are given,
the standard input is
summed.
SH SOURCE
B /sys/src/cmd/sum.c
br
B /sys/src/cmd/md5sum.c
br
B /sys/src/cmd/sha1sum.c
SH "SEE ALSO"
IR cmp (1),
IR wc (1)

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