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lang-bash
ksh93have$KSH_VERSION. That variable comes frompdkshand never made it to AT&T ksh88.FCEDIT.posh(pdksh with most non-POSIX features removed so you would probably want to call it "sh") has no FCEDIT nor KSH_VERSION but has PS3 (maybe not for long), though it's unlikely for one to have it as a login shell. Also note that the code above wouldn't reflect whetherbashorzshare inshemulation mode, which may be a problem if you're using$PROFILE_SHELLto decide whether or not to enable this or that feature. See also Sven Mascheck's whatshell for more you may (or may not) want to check.