How do i setup rsh and how do i mount ext2 or ext3 filesystem?

I've seen both asked frequently but not answered, and found the answer.

rsh(1) and rsync(1), at least in El Capitan, works out of the box just as it does in linux*. I absolutely DO NOT suggest ssh before rsh is first tried. (rsh and rcp(1) allows seamlessly remote commands and or unix terminals between linux and iMac or two iMac)

mounting ext2 and other unix filesystems linux supports in El Capitan?

However one doesn't need mount (structure detailed access for each filesystem versions/types): for migration or every day remote access: rsh(1) and rsync(1) work. One can rsync or rcp a file from linux flash card to iMac disk /Volume/which easily - diverting need of installing many apps - if NTFS that both use isnt good enough.

There are apps that allow iMac to read ext2, but the access works within the apps, not seamlessly and *not* supported by Apple, from what I understand.

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* see man page for rsh, make a ~/.rhosts file listing ok hostnames, that's all there is to do to also allow incoming rsh from another unix computer. there's tons of documentation for setting up networking between hosts in linux (telnet, rsh). however that's already all done for iMac out of box. if your linux box works (i.e. rsh between two linux boxes) the it will work with iMac as well (note that means your username is same, password is same on both computers, and both hosts have ~/.rhosts of all hosts allowed to participate).

** some mac articles say not to setup rsh and to use ssh(1) - i say NO, ssh very complicated to setup but works if you manage to do it (if you make a mistake all your certifications are for naught, all data is sent plain text anyway, after all that), but if your even asking the question answer is rsh(1)

**** iMac doesn't support any. Linux kernel (and mount(1) support apple HFS and HFS+ (for OS/X 8+), however I would only use that support on a flash drive personally, not on your iMac - it might not be safe! from /sbin/mount_* we see El Capitan likes: acts, afp, cd9660, cddafs, devfs, exfat, fdesc, ftp, hfs, msdos, nfs, ntfs, smbfs, udf, webdav.

<Edited by Host>