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': Starting from emacs -Q go into eshell (M-x eshell) executing the following c++ program: #include int main() { std::cerr << "ERROR\n"; std::cout << "OUTPUT\n"; } provides the following output: ~ $ ./a.out 2> /dev/null ERROR OUTPUT From which it seems that eshell ignores stderr and sends everything to stdout If Emacs crashed, and you have the Emacs process in the gdb debugger, please include the output from the following gdb commands: `bt full' and `xbacktrace'. For information about debugging Emacs, please read the file /usr/share/emacs/24.3/etc/DEBUG. In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7) of 2014-03-07 on lamiak, modified by Debian Windowing system distributor `The X.Org Foundation', version 11.0.11600000 System Description: Ubuntu 14.04.3 LTS Configured using: `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp' '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes' '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2'' Important settings: value of $LC_MONETARY: it_IT.UTF-8 value of $LC_NUMERIC: it_IT.UTF-8 value of $LC_TIME: it_IT.UTF-8 value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: EShell Minor modes in effect: shell-dirtrack-mode: t keyfreq-autosave-mode: t keyfreq-mode: t global-undo-tree-mode: t undo-tree-mode: t electric-pair-mode: t ido-everywhere: t show-paren-mode: t yas-global-mode: t yas-minor-mode: t ecb-minor-mode: t TeX-PDF-mode: t TeX-source-correlate-mode: t global-linum-mode: t display-time-mode: t recentf-mode: t winner-mode: t tooltip-mode: t mouse-wheel-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 temp-buffer-resize-mode: t line-number-mode: t transient-mark-mode: t Recent input: n d SPC SPC d a s h C-x b s h . / a C-c C-d b a s h C-c C-d C-c C-c . / a 2 > SPC / d e b v / n u l l M-x s h e l . / a 2 > SPC / d e q b / v ( n / n u M-x t e r m . / d e . / a 2 > SPC / d e v / n u C-x b M-x e s h C-x b C-c C-c l s M-x r e p o r t Recent messages: History item: 125 History item: 128 History item: 127 History item: 126 History item: 125 History item: 124 Mark set Making completion list... You can run the command `eshell' with C-c . e Making completion list... 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