Use md5sum rather than gmd5sum for FreeBSD

[sunpoet]

FreeBSD has md5sum in the base system. It also avoids the hack for gmd5sum.

Reference: https://man.freebsd.org/cgi/man.cgi?query=md5sum

[Cyan4973]

I wonder why there was a contribution to employ gmd5sum on FreeBSD, at a time when md5sum was our default ?
It implied that md5sum was not a good default for FreeBSD at the time ?
(Note: this contribution was made by @DimitryAndric in #475. Feel free to weight in)

Also, looking around on this topic, I see this sentence :

Use md5 on FreeBSD. The standard command for calculating MD5 checksums on FreeBSD systems is md5, not md5sum or gmd5sum.

And now I'm even more confused.

[DimitryAndric]

I think #475 was because we didn't have a GNU compatible md5sum command in base at the time, but only a slightly incompatible md5 command (it produces md5 hashes obviously, but its output is different than GNU md5sum's).

Now all supported FreeBSD versions (I think from 13.x onwards) do have a md5sum command that behaves similarly to the GNU version.

[dearblue]

For reference.
The md5sum command was introduced with the md5 -r switch on FreeBSD in 13.1 (2022-05-16) or 14.0 (2023-11-20).

• https://www.freebsd.org/releases/13.1R/relnotes/#userland-programs
• https://www.freebsd.org/releases/14.0R/relnotes/#mfc-highlights
• freebsd/freebsd-src@086feed

In addition, currently supported FreeBSD versions are 14.0, 13.3 and 13.2 (end of life is 2024-06-30).

Finally, a small difference between md5sum and md5 -r is quoted from the manual.

difference between `md5sum` and `md5 -r`

from: https://man.freebsd.org/cgi/man.cgi?query=md5sum&manpath=FreeBSD+14.0-RELEASE+and+Ports

Calculate the checksum of multiple files reversing the output:

      $ md5 -r /boot/loader.conf /etc/rc.conf
      ada5f60f23af88ff95b8091d6d67bef6 /boot/loader.conf
      d80bf36c332dc0fdc479366ec3fa44cd /etc/rc.conf

This is almost but not quite identical to the output from GNU mode:

      $ md5sum /boot/loader.conf /etc/rc.conf
      ada5f60f23af88ff95b8091d6d67bef6  /boot/loader.conf
      d80bf36c332dc0fdc479366ec3fa44cd  /etc/rc.conf

Note the two spaces between hash and file name.