Add manpage for b3sum

b3sum/b3sum.1

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+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.49.3.
+.TH B3SUM "1" "August 2024" "b3sum 1.5.4" "User Commands"
+.SH NAME
+b3sum \- Print or Check BLAKE3 Checksums
+.SH SYNOPSIS
+.B b3sum
+[\fI\,OPTIONS\/\fR] [\fI\,FILE\/\fR]...
+.SH DESCRIPTION
+.SS "Arguments:"
+.IP
+[FILE]...
+.IP
+Files to hash, or checkfiles to check
+.IP
+When no file is given, or when \- is given, read standard input.
+.SH OPTIONS
+.HP
+\fB\-\-keyed\fR
+.IP
+Use the keyed mode, reading the 32\-byte key from stdin
+.HP
+\fB\-\-derive\-key\fR <CONTEXT>
+.IP
+Use the key derivation mode, with the given context string
+.IP
+Cannot be used with \fB\-\-keyed\fR.
+.HP
+\fB\-l\fR, \fB\-\-length\fR <LEN>
+.IP
+The number of output bytes, before hex encoding
+.IP
+[default: 32]
+.HP
+\fB\-\-seek\fR <SEEK>
+.IP
+The starting output byte offset, before hex encoding
+.IP
+[default: 0]
+.HP
+\fB\-\-num\-threads\fR <NUM>
+.IP
+The maximum number of threads to use
+.IP
+By default, this is the number of logical cores. If this flag is omitted, or if its value
+is 0, RAYON_NUM_THREADS is also respected.
+.HP
+\fB\-\-no\-mmap\fR
+.IP
+Disable memory mapping
+.IP
+Currently this also disables multithreading.
+.HP
+\fB\-\-no\-names\fR
+.IP
+Omit filenames in the output
+.HP
+\fB\-\-raw\fR
+.IP
+Write raw output bytes to stdout, rather than hex
+.HP
+\fB\-\-no\-names\fR is implied. In this case, only a single input is allowed.
+.HP
+\fB\-c\fR, \fB\-\-check\fR
+.IP
+Read BLAKE3 sums from the [FILE]s and check them
+.HP
+\fB\-\-quiet\fR
+.IP
+Skip printing OK for each checked file
+.IP
+Must be used with \fB\-\-check\fR.
+.HP
+\fB\-h\fR, \fB\-\-help\fR
+.IP
+Print help (see a summary with '\-h')
+.HP
+\fB\-V\fR, \fB\-\-version\fR
+.IP
+Print version