This bug report will be sent to the Bug-GNU-Emacs mailing list and the GNU bug tracker at debbugs.gnu.org. Please check that the From: line contains a valid email address. After a delay of up to one day, you should receive an acknowledgment at that address. Please write in English if possible, as the Emacs maintainers usually do not have translators for other languages. Please describe exactly what actions triggered the bug, and the precise symptoms of the bug. If you can, give a recipe starting from `emacs -Q': I started emacs with /Applications/Emacs.app/Contents/MacOS/Emacs -Q I typed M-x shell RET At the shell prompt, I typed "cd doc", then I hit the TAB key. The shell's current directory was my home directory, and that directory contains a subdirectory named "Documents". I expected the TAB key to complete the name "Documents", but it just beeped. I then did M-: (setq completion-ignore-case t) RET, and tried again, but it still just beeped. In GNU Emacs 24.3.1 (x86_64-apple-darwin, NS apple-appkit-1038.36) of 2013-03-12 on bob.porkrind.org Windowing system distributor `Apple', version 10.3.1187 Configured using: `configure '--host=x86_64-apple-darwin' '--build=i686-apple-darwin' '--with-ns' 'build_alias=i686-apple-darwin' 'host_alias=x86_64-apple-darwin' 'CC=gcc -mmacosx-version-min=10.7 -isystem /Users/david/Xcode-10.7_4.5.2/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/usr/include/ -F/Users/david/Xcode-10.7_4.5.2/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks'' Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Shell Minor modes in effect: shell-dirtrack-mode: t tooltip-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent input: C-x d M-x s h e l l l s c d SPC d e o c o c C-c C-u C-h v c o m p l e o i - i g - c c d SPC D o d o c M-x s e t - v a r c o m p l - o i g - C-g C-x o C-x 0 C-h v M-p C-k r e a d - f i i C-x 1 C-h c M-x s e t - v a r c o m p l C-g C-h v M-p C-k c o m p l e o - i g - c M-: M-p M-( s e t q SPC c o m p l e i o - i g - c SPC t M-x r e p o r t - e m Recent messages: TAB (translated from ) runs the command completion-at-point No match Making completion list... Quit Making completion list... Type C-x 1 to delete the help window. user-error: Beginning of history; no preceding item Making completion list... [2 times] t No match Load-path shadows: None found. Features: (shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils help-mode easymenu help-fns pcmpl-unix shell pcomplete comint ansi-color ring dired time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel ns-win tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process ns multi-tty emacs)