The "ibm" and "oldibm" tables are identical, because POSIX just
standardised the table from V7. Nobody, including the original authors,
seems to have noticed this. Merge them and update the documentation.
Also fix the odd, inconsistent, spelling of "pre-4.3BSD-Reno").
(From nabijaczleweli)

dd.1: add an example of writing a NetBSD image

branches: 1.36.6;
Fix typos; use American spelling consistently. Remove an unnecessary macro.

adjust the open flags available for dd to match actual reality
of what matters. remove "search" for now, since O_SEARCH has
no backend. document them all.

branches: 1.34.6;
Use Ex.

Remove workaround for ancient HTML generation code.

bump date

dd first appeared in V5, not V1
Heads up by Ingo Schwarze
http://www.tuhs.org/cgi-bin/utree.pl?file=V5/usr/source/s1/dd.c

Document the version dd first appeared.
Bump date.

Pp not required before Bd, picked up by mandoc lint

The macro to cross-reference is Xr, not Xt.
Fix typo error picked up by mandoc lint.

New sentence, new line. Fix typos. Bump date for previous.

Add iflag and oflag operands to dd(1)

Like GNU dd(1) similar operands, iflag and oflag allow specifying the
O_* flags given to open(2) for the input and the output file. The values
are comma-sepratated, lower-case, O_ prefix-stripped constants documented
in open(2).

Since iflag and oflag override default values, specifying oflag means
O_CREATE is not set by default and must be specified explicitely.

Some values do not make sense (e.g.: iflag=directory) but are still used
and will raise a warning. For oflag, values rdonly, rdwr and wronly are
filtered out with a warning (dd(1) attempts open(2) with O_RDWR and
then O_WRONLY on failure).

Specifying oflag=trunc along with (seek, oseek or conv=notrunc) is
contradictory and will raise an error.

iflag and oflag are disabled if building with -DMALLPROG

branches: 1.25.12;
- sync `SYNOPSIS' with dd.c's `usage' line;
- correct spelling (prepositions).

From Bug Hunting.

Add a new command to dd(1): msgfmt. The command modifies the
output of the information summary returned by dd(1). This can be used
to specify messages in a more usable (or parseable) format like
human-readable values.

My intent is to re-use this for building image files and quick I/O
benchmarking.

Reviewed by tsutsui@ on tech-userlevel. See also
http://mail-index.netbsd.org/tech-userlevel/2010/12/03/msg004179.html

Some examples:

$ dd if=/dev/zero of=/dev/null bs=1m count=1 msgfmt=human
1+0 records in
1+0 records out
1048576 bytes (1,0 MB) transferred in 0.001 secs (1048576000 bytes/sec - 1,0 GB/sec)

$ dd if=/dev/zero of=/dev/null count=1 msgfmt='
> <speed>%E</speed>
> <time>%s</time>
> <bytes>%b</bytes>
> '
<speed>500 KB/sec</speed>
<time>0.001</time>
<bytes>512</bytes>

branches: 1.23.6;
Add iseek and oseek option as aliases for skip and seek respectively.
These options exist in dd of solaris or svr3. From FreeBSD.

Don't workaround macro argument limit in ancient troff.

branches: 1.21.20;
Use IEC 60027-2 prefixes for 2^n based prefixes.

Bump date for progress=n description change.

In "dd progress=N", let the value of N control how often
to print a "." to stderr. Previously, any non-zero
value behaved like "progress=1".

PR 24300

Approved by christos

Spell the plural of suffix "suffixes", not "suffices".
Inspired by PR 24400 by Todd Vierling.

add support for conv=sparse
inspired by freebsd, although this patch attempts
to avoid some potential bugs in their implementation.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22249, verified by myself.

.Nm does not need a dummy argument ("") before punctuation or
for correct formatting of the SYNOPSIS any longer.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Drop a space and an unnecessary .Pp.

fix conv= description

- Use u_longlong_t instead of u_quad_t, u_long, or int for various buffer sizes
- Add strsuftoull(), which parses a number into a u_longlong_t, with
multiplication support, and support for 'g' (GB) and 't' (TB) suffices.
If an error occurs, print to stderr and exit.
Based on get_blk() from args.c and strsufto*() (in other programs)
- Add strsuftoullx(), which acts as per strsuftoull() but returns the
error in the supplied buffer instead (if the returned buffer != "", an
error occurred)
- Replace get_bsz() use with strsuftoull()
- Remove (now) unnecessary argument validation
- Remove unused {f,p,s,t}_stats fields in struct IO

For commands and utilities, use EXIT STATUS rather than RETURN VALUES as
appropriate (and documented in mdoc(7)).

Add 'RETURN VALUE' section header.

branches: 1.8.8;
Add "progress=1" switch to show a sign of life by printing a '.' for
every block written to the output file.

macroize BSD, NetBSD, FreeBSD and misc cleanup

Fix .Nm usage.

convert to new RCS id conventions.

ECBDIC->EBCDIC

Merge 4.4-Lite version.

Add RCS indentifiers.

branches: 1.1.1;
added dd(1) from ftp.uu.net:bsd-sources; torching GNU dd