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Subject: bug#78963: 31.0.50; getenv sends nil
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(getenv "HOSTNAME")

returns nil instead of value of $HOSTNAME

In GNU Emacs 31.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version
  3.24.33, cairo version 1.16.0) of 2025-07-05 built on MY_HOST
Repository revision: 4024a7d541ca049ca9b28bce54c225bf9691f944
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.5 LTS

Configured using:
  'configure --with-mailutils --with-modules -with-tree-sitter'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG
RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE
XIM XINERAMA XINPUT2 XPM XRANDR GTK3 ZLIB

Important settings:
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   value of $XMODIFIERS: @im=ibus
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Major mode: Lisp Interaction

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   eldoc-mode: t
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   tool-bar-mode: t
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Load-path shadows:
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Features:
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Memory information:
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Andreas =?UTF-8?Q?R=C3=B6hler?= <andreas.roehler@HIDDEN>
Subject: bug#78963: Acknowledgement (31.0.50; getenv sends nil)
Message-ID: <handler.78963.B.175174063811429.ack <at> debbugs.gnu.org>
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Date: Sat, 05 Jul 2025 18:38:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#78963: 31.0.50; getenv sends nil
Resent-From: Andreas Schwab <schwab@HIDDEN>
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To: Andreas =?UTF-8?Q?R=C3=B6hler?= <andreas.roehler@HIDDEN>
Cc: 78963 <at> debbugs.gnu.org
From: Andreas Schwab <schwab@HIDDEN>
In-Reply-To: <cf0a1d5e-8c25-488a-b4fe-ef3a6e988b91@HIDDEN> ("Andreas
 =?UTF-8?Q?R=C3=B6hler?="'s message of "Sat, 5 Jul 2025 20:36:57 +0200")
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Date: Sat, 05 Jul 2025 21:35:26 +0200
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On Jul 05 2025, Andreas Röhler wrote:

> (getenv "HOSTNAME")
>
> returns nil

Which means that there is no HOSTNAME in the calling environment.

> instead of value of $HOSTNAME

How did you determine that?

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#78963: 31.0.50; getenv sends nil
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Sun, 06 Jul 2025 07:48:20 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
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tags 78963 notabug
thanks

> Date: Sat, 5 Jul 2025 20:36:57 +0200
> From: Andreas Röhler <andreas.roehler@HIDDEN>
> 
> (getenv "HOSTNAME")
> 
> returns nil instead of value of $HOSTNAME

$HOSTNAME is not an environment variable, it's a Bash variable, see

  https://superuser.com/questions/132489/hostname-environment-variable-on-linux

The way to get the host name in Emacs is by calling the function
system-name.

This is not a bug, but a cockpit mistake on your part.

Message received at control <at> debbugs.gnu.org:

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Date: Sun, 06 Jul 2025 07:48:20 +0300
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Subject: Re: bug#78963: 31.0.50; getenv sends nil
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tags 78963 notabug
thanks

> Date: Sat, 5 Jul 2025 20:36:57 +0200
> From: Andreas Röhler <andreas.roehler@HIDDEN>
> 
> (getenv "HOSTNAME")
> 
> returns nil instead of value of $HOSTNAME

$HOSTNAME is not an environment variable, it's a Bash variable, see

  https://superuser.com/questions/132489/hostname-environment-variable-on-linux

The way to get the host name in Emacs is by calling the function
system-name.

This is not a bug, but a cockpit mistake on your part.

Last modified: Sun, 6 Jul 2025 05:00:02 UTC

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