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Signed-off-by: Mattias Andrée <maandree@kth.se>

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-.TH SHA1SUM 1 anysum
-.SH NAME
-sha1sum - compute or verify against multiple SHA-1 hashes
-
-.SH SYNOPSIS
-.B sha1sum
-.RB [ -c
-.RB [ -w ]]
-.RB [ -W
-.IR options ]\ ...
-.RB [ -z ]
-.RI [ file ]\ ...
-
-.SH DESCRIPTION
-The
-.B sha1sum
-utility calculates and prints or checks SHA-1 checksums.
-.PP
-The
-.B sha1sum
-utility can also check a file against multiple SHA-1
-checksums, and check that the file matches at least one
-of the listed checksums.
-
-.SH OPTIONS
-The sha1sum utility conforms to the Base Definitions volume of
-POSIX.1-2017,
-.IR "Section 12.2" ,
-.IR "Utility Syntax Guidelines" .
-.PP
-The following options are supported:
-.TP
-.B -b
-Read in binary mode when computing hashes.
-.TP
-.B -c
-Verify the the files listed in file against the
-checksums listed on the same lines. The file
-shall be formatted as the output of the utility
-when this option is not used. See the
-.B STDOUT
-section for more information. If a file is listed
-multiple times, it need only match one of the
-checksums listed for the file.
-
-The length of the listed checksums need not match
-the length output by this utility; before the
-checksums are compared, they are truncated to the
-shorter of the two checksums.
-.TP
-.B -t
-Read in text mode when computing hashes.
-.TP
-.BR -W \ \fIoptions\fP
-Comma-sepearated list of implementation-specific
-options. The following options are supported:
-.RS
-.TP
-.BI output= format
-.I format
-shall be
-.RB \(dq lowercase \(dq
-if the checksums shall be printed in lowercase
-hexadecimal format (default),
-.RB \(dq uppercase \(dq
-for uppercase hexadecimal format, or
-.RB \(dq binary \(dq
-for binary format without anything but the
-checksum printed to standard output. This
-option is ignored if the
-.B -c
-option is used.
-.TP
-.BI input= format
-.I format
-shall be
-.RB \(dq binary \(dq
-if the files are be read in binary mode,
-.RB \(dq text \(dq
-if the files shall be read in text mode, or
-.RB \(dq hexadecimal \(dq
-they shall be decoded from hexadecimal to
-binary. If the
-.B -c
-option is used, the mode specification
-associated with a file is overrides this
-behaviour for that file if the line
-specifies hexadecimal mode.
-.TP
-.B recursive
-If a
-.I file
-operand is a directory, the checksum is computed for
-all files recursively. This option is ignored if the
-.B -c
-option is used.
-.TP
-.B no-recursive
-The utility shall traverse directories.
-(This is the default behaviour).
-.TP
-.B xdev
-Implies
-.B -W recursive
-but also allows the recursion across mountpoints.
-.TP
-.B no-xdev
-Disable recursion across mountpoints.
-(This is the default behaviour).
-Note that this does not disable
-recursion by itself.
-.TP
-.B xlink
-Implies
-.B -W recursive
-but also allows the recursion across symbolic links.
-.TP
-.B no-xlink
-Disable recursion across symbolic links.
-(This is the default behaviour).
-Note that this does not disable
-recursion by itself.
-.RE
-.TP
-.B -w
-Warn about, but skip, lines that are not properly
-formatted.
-.TP
-.B -z
-Use NUL byte as line ending instead of LF.
-.PP
-There is no difference between binary mode and text mode,
-so the
-.B -b
-and
-.B -t
-options are ignored, except that they undo
-.BR "-W input=hexadecimal" .
-
-.SH OPERANDS
-The following operand is supported:
-.TP
-.I file
-The file to read and compute the checksum for, or if the
-.B -c
-option is used, use as the listing of files and checksums
-to verify the files against. If dash
-.RB (' - ')
-is used or if no file operand is specified, standard input
-will be used.
-
-.SH STDOUT
-If the
-.B -c
-option is not used, the utility shall print the following
-line for each calculated checksum, however there are options
-that modify the format; see the
-.B OPTIONS
-section for more information:
-.PP
-.RS
-.B \(dq%s %c%s\en\(dq,
-.RI < hash >\fB,\fP
-.RI < mode >\fB,\fP
-.RI < file >
-.RE
-.PP
-where
-.I mode
-is SP (' ') for text mode, an asterisk
-.RB (' * ')
-for binary mode, or a pound sign
-.RB (' # ')
-for hexadecimal mode; however if there is no difference
-between binary mode and text mode and either is selected,
-SP (' ') (text mode) is used.
-.PP
-If the
-.B -c
-option the output shall be on the format:
-.PP
-.RS
-.B \(dq%s: %s\en\(dq,
-.RI < file >\fB,\fP
-.RI < validity >
-.RE
-.PP
-where
-.I validity
-is an implementation specified string
-that describes whether the checksum was valid (possibly
-with remarks), the file did not exist, the file could
-not be read (possibly with error information), or if
-the checksum was invalid or could not be compared
-(possibly with remarks). The
-.B -z
-option does not modify the line ending.
-
-.SH EXIT STATUS
-The following exit values are returned:
-.TP
-0
-Successful completion.
-.TP
-1
-Checksums did not match or a file did not exist.
-.TP
-2
-An error occurred.
-
-.SH NOTES
-Other implementations do not necessarily recognise the
-hexadecimal mode specifier
-.RB (' # ')
-in checksum list files.
-.PP
-The
-.B -c
-option accepting truncated checksums is an
-implementation-specific behaviour.
-.PP
-Be advised that SHA-1 is compromised.
-
-.SH SEE ALSO
-.BR anysum (1)