1. Enter a command that the system does not recognize (such as #ig) to get the system prompt
aix5.3:/#ig
ksh: ig: not found. Br>
2,#echo $0 (applicable: sh/ksh)
aix5.3:/#echo $0
-ksh
3,#echo $SHELL (user default shell, but does not reflect the current shell in real time)
aix5.3:/#echo $SHELL
/usr/Bin/ksh
4,#ps
aix5.3:/#ps
PID TTY TIME CMD
1843380 pts /56 0:00 -ksh
2269246 pts/56 0:00 ps
Also applicable to other UNIX/LINUX systems.
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