(interpreter-mode-alist): Add most shells, with sh-mode.

Add tail, more, less, pg with text-mode.
(auto-mode-alist): Recognize extensions that indicate
shell scripts, as well as common init file names.

lisp/files.el

@@ -940,6 +940,10 @@ run `normal-mode' explicitly."
     ("ChangeLog.[0-9]+\\'" . change-log-mode)
     ("\\$CHANGE_LOG\\$\\.TXT" . change-log-mode)
     ("\\.scm\\.[0-9]*\\'" . scheme-mode)
+    ("\\.c?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode)
+    ("/\\.\\(bash_profile\\|z?login\\|bash_login\\|z?logout\\)\\'" . sh-mode)
+    ("/\\.\\(bash_logout\\|[kz]shrc\\|bashrc\\|t?cshrc\\|esrc\\)\\'" . sh-mode)
+    ("/\\.\\([kz]shenv\\|xinitrc\\|startxrc\\|xsession\\)\\'" . sh-mode)
 ;;; The following should come after the ChangeLog pattern
 ;;; for the sake of ChangeLog.1, etc.
 ;;; and after the .scm.[0-9] pattern too.
@@ -998,7 +1002,28 @@ REGEXP and search the list again for another match.")
     ("awk" . awk-mode)
     ("nawk" . awk-mode)
     ("gawk" . awk-mode)
-    ("scm" . scheme-mode))
+    ("scm" . scheme-mode)
+    ("ash" . sh-mode)
+    ("bash" . sh-mode)
+    ("csh" . sh-mode)
+    ("dtksh" . sh-mode)
+    ("es" . sh-mode)
+    ("itcsh" . sh-mode)
+    ("jsh" . sh-mode)
+    ("ksh" . sh-mode)
+    ("oash" . sh-mode)
+    ("pdksh" . sh-mode)
+    ("rc" . sh-mode)
+    ("sh" . sh-mode)
+    ("sh5" . sh-mode)
+    ("tcsh" . sh-mode)
+    ("wksh" . sh-mode)
+    ("wsh" . sh-mode)
+    ("zsh" . sh-mode)
+    ("tail" . text-mode)
+    ("more" . text-mode)
+    ("less" . text-mode)
+    ("pg" . text-mode))
   "Alist mapping interpreter names to major modes.
 This alist applies to files whose first line starts with `#!'.
 Each element looks like (INTERPRETER . MODE).