How can I tell which Unix shell I am using? [duplicate]
Try:
echo $0
This often works across a range of shells.
Mac
ps
PID TTY TIME CMD
223 ttys000 0:00.33 -bash
OpenBSD
ps
PID TT STAT TIME COMMAND
20038 p0 Ss 0:00.01 -ksh (ksh)
22251 p0 R+ 0:00.00 ps
Or just echo $SHELL.
The echo $SHELL command will give you your shell name relative to root.