mirror of
https://github.com/Luzifer/password.git
synced 2024-11-14 20:22:47 +00:00
75 lines
2.9 KiB
Markdown
75 lines
2.9 KiB
Markdown
|
Persistent variables shell
|
||
|
|
==========================
|
||
|
|
|
||
|
|
Environment variables are a per process thing. So something needs to store the
|
||
|
|
state to disk and load it in to it's environment and pass that environment on to
|
||
|
|
it's child processes.
|
||
|
|
|
||
|
|
This is generally done by the shell, I don't think there is a cross shell way to
|
||
|
|
tell a shell to persist an environment variable to it's configuration.
|
||
|
|
|
||
|
|
|
||
|
|
https://help.ubuntu.com/community/EnvironmentVariables
|
||
|
|
|
||
|
|
|
||
|
|
## Persistent environment variables
|
||
|
|
|
||
|
|
The names of environment variables are case sensitive.
|
||
|
|
|
||
|
|
It is a common practice to name all environment variables with only English
|
||
|
|
capital letters and underscore (_) signs.
|
||
|
|
|
||
|
|
Note: The shell techniques explained in the following sections apply to the
|
||
|
|
Bourne Shell family of command line shells, which includes sh, ksh, and bash,
|
||
|
|
which is the default shell shipped with Ubuntu. The commands may be different on
|
||
|
|
other shells such as csh.
|
||
|
|
|
||
|
|
### System-wide environment variables
|
||
|
|
|
||
|
|
Environment variable settings that affect the system as a whole (rather than
|
||
|
|
just a particular user) should not be placed in any of the many system-level
|
||
|
|
scripts that get executed when the system or the desktop session are loaded, but
|
||
|
|
into
|
||
|
|
|
||
|
|
/etc/environment - This file is specifically meant for system-wide
|
||
|
|
environment variable settings. It is not a script file, but rather consists
|
||
|
|
of assignment expressions, one per line. Specifically, this file stores the
|
||
|
|
system-wide locale and path settings.
|
||
|
|
|
||
|
|
Note: Any variables added to these locations will not be reflected when invoking
|
||
|
|
them with a sudo command, as sudo has a default policy of resetting the
|
||
|
|
Environment and setting a secure path (this behavior is defined in
|
||
|
|
/etc/sudoers). As a workaround, you can use "sudo su" that will provide a shell
|
||
|
|
with root privileges but retaining any modified PATH variables.
|
||
|
|
|
||
|
|
Note: When dealing with end-user/home desktop systems may be appropriate to
|
||
|
|
place settings in the user's ~/.pam_environment files discussed above rather
|
||
|
|
than the system-wide ones, since those files do not require one to utilize root
|
||
|
|
privileges in order to edit and are easily moved between systems.
|
||
|
|
|
||
|
|
Note: Some systems now use an envvar.sh placed in the /etc/profile.d/ directory
|
||
|
|
to set system wide environment strings.
|
||
|
|
|
||
|
|
### Session-wide environment variables
|
||
|
|
|
||
|
|
Environment variable settings that should affect just a particular user (rather
|
||
|
|
than the system as a whole) should be set into:
|
||
|
|
|
||
|
|
~/.pam_environment - This file is specifically meant for setting a user's
|
||
|
|
environment. It is not a script file, but rather consists of assignment
|
||
|
|
expressions, one per line.
|
||
|
|
|
||
|
|
PATH DEFAULT=${PATH}:${HOME}/MyPrograms
|
||
|
|
|
||
|
|
Note: Using .pam_environment requires a re-login in order to initialize the
|
||
|
|
variables. Restarting just the terminal is not sufficient to be able to use the
|
||
|
|
variables.
|
||
|
|
|
||
|
|
If you are using KDE, see http://userbase.kde.org/Session_Environment_Variables/en
|
||
|
|
|
||
|
|
|
||
|
|
## Windows
|
||
|
|
|
||
|
|
http://support.microsoft.com/kb/310519
|
||
|
|
|