AIX, HP-UX, macOS, Xinuos, z/OS (see "Single UNIX Specification", wikipedia)
since i suspect there aren't users of 4 of those on dovenet (the most likely being perhaps AIX), might i suggest this echo be used only for macOS?
I was a professional user of z/OS until recently. ;) I used several
console utilities that "sat on top of" it, but I only got down to using
things from the *nix command line once or twice.
* SLMR 2.1a * "End of quote. Repeat the line." - Biden Words of Wisdom
---
þ Synchronet þ CAPCITY2 * capcity2.synchro.net * Telnet/SSH:2022/Rlogin/HTTP