#ALGOL (60 / 68 / W), 74 6947 bytes
Run this full program with a68g save.a68, using algol68g.
DO print("4 8 15 16 23 42");system("ping 1.0 -c1 -w6240>/dev/null")OD
ALGOL doesn't have a sleep builtin, so way to sleep but we can abuse ping which is surely on a Unix of the time (Idea from here).
If run essentially /bin/sleep(1) is on whichever Unix is running this ALGOL program, then 47 bytes:
DO print("4 8 15 16 23 42");system("sleep 1")OD
OP says in the challengeOld answer:
OS compatibility is not an issueALGOL doesn't have a sleep builtin, but you couldn't use system() in C to send out bash commands out toso we can abuse ping which is surely on a Unix of the terminal.time (As an exampleidea from here) for 74 69 bytes.
ALGOL's system is pretty much the same as the C standard library's system(3), but the OP seems to also be okay with my use of system for ping(8) above, so I don't know how they'll feel about sleep(1).
DO print("4 8 15 16 23 42");system("ping 1.0 -c1 -w6240>/dev/null")OD