Hi Gottfried,
I hope this strikes the right balance between explaining ‘environment
variables’ from scratch and answering your immediate question.
Gottfried 写道：
1. Will this now overwrite my variables for ever, or only for some time?
Environment variables are not saved. They can be *set* by configuration
files, such at /etc/profile, but these files are not updated when you
type ‘export GUIX=awesome’ on the command line.
Setting LC_ALL like this affects your current shell, and it will be
inherited by child processes (hence why the ‘guix’ child will speak
English after setting LC_ALL=C in the parent shell), but they exist
purely in RAM for the lifetime of each process.
The also do not propagate to ancestor or sibling processes: setting
LC_ALL in one terminal window has no effect on any other windows. Nor
will setting LC_ALL in a shell affect new processes you launch
elsewhere, such as from your desktop menu. Only child processes
launched in the same shell/window will inherit it.
As soon as you close that terminal, type ‘exit’ in the (guix) shell, or
trip over your power cable, the setting is gone.
2. How can I set it back to my original state?
Environment variables have no built-in notion of history, or defaults.
They are just variables, and setting them to something new overwrites
the old value (if any).
So:
~$ echo $LC_ALL # yours will be de_DE, I presume
en_IE.utf8
~$ LC_OLD=$LC_ALL # save the old value
~$ export LC_ALL=C # in with the new
~$ echo $LC_ALL # do the thing
C
~$ LC_ALL=$LC_OLD # restore the old value
But really, in practice, I'd just close the window/shell once done…
they are so cheap.
Kind regards,
T G-R
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