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Can system modify an environment variable in the current environment?
From: |
Mortimer Cladwell |
Subject: |
Can system modify an environment variable in the current environment? |
Date: |
Thu, 2 Sep 2021 15:49:36 -0400 |
Hi,
Consider my file test.scm:
(define (main args)
(let* ((myvar (string-append "export
GUILE_LOAD_PATH=/some/random/text:$GUILE_LOAD_PATH"))
(statement1 (system (string-append "echo " myvar " >>
$HOME/.bashrc")))
(statement2 (system myvar)))
(write myvar)))
At the terminal:
mbc@HP8300:~/temp$ echo $GUILE_LOAD_PATH
/home/mbc/.guix-profile/share/guile/site/3.0
mbc@HP8300:~/temp$ guile -e main -s test.scm
"export GUILE_LOAD_PATH=/some/random/text:$GUILE_LOAD_PATH"
mbc@HP8300:~/temp$ echo $GUILE_LOAD_PATH
/home/mbc/.guix-profile/share/guile/site/3.0
At the end of .bashrc I see the last line is:
export
GUILE_LOAD_PATH=/some/random/text:/home/mbc/.guix-profile/share/guile/site/3.0
If I close and reopen the terminal and:
mbc@HP8300:~$ echo $GUILE_LOAD_PATH
/some/random/text:/home/mbc/.guix-profile/share/guile/site/3.0
So statement1 works as expected, modifying .bashrc which is then effective
in modifying GUILE_LOAD_PATH on future invocations of terminal.
statement2 is an attempt to modify the current running environment, but
fails.
Note that if I paste export
GUILE_LOAD_PATH=/some/random/text:$GUILE_LOAD_PATH directly into the
terminal, that successfully modifies the variable.
Why does (system myvar) i.e. (system "export
GUILE_LOAD_PATH=/some/random/text:$GUILE_LOAD_PATH") fail?
Thanks
Mortimer
- Can system modify an environment variable in the current environment?,
Mortimer Cladwell <=