+.TP
+SHELL
+The file name of the users login shell.
+.TP
+TERMCAP
+The string describing the terminal in TERM,
+or the name of the termcap file, see
+.IR termcap (5), termlib (3).
+.TP
+EXINIT
+A startup list of commands read by
+.IR ex (1),
+.IR edit (1),
+and
+.IR vi (1).