How to set windows environment variable In tcl script

Question

I am working on a Tcl script in which I have a variable and I just want to keep its value alive after the completion of its execution, so I am trying to define a windows environment variable by executing the set windows command within the script using the exec function.

I have also tried to find the solution through google but that too didn't work. Here is the line of code which I have tried

exec set verName=$xVar

It would be great if you can help me. Thanks in advance.

set env(YOUR_VARIABLE) value will set the environmental variable and it is available only during the execution. i.e. It is temporary, not a permanent. — Dinesh
– Dinesh, Commented Jun 3, 2016 at 12:07

Community · Accepted Answer · 2017-05-23 11:55:07Z

2

First, read this question and its accepted answer: Set a persistent environment variable from cmd.exe

How do you do that from Tcl? Well, the standard registry package gives you the tools:

package require registry

set root {HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment}
set theVariable "ABCDE"
set theValue "12345XYZ"

registry set $root\\$theVariable $theValue
registry broadcast "Environment"

The manual page for the registry package has a specific example for using this with the PATH. Updating to other variables is trivial. The script will need to be run in a session with Administrator privileges in order to update that part of the registry.

edited May 23, 2017 at 11:55

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answered Jun 3, 2016 at 12:43

Donal Fellows

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3 Comments

Joey Over a year ago

This won't affect the calling process, though. Unless it is Explorer.

Donal Fellows Over a year ago

@Joey That depends on whether the process listens for the WM_SETTINGSCHANGED event and acts on it right.

Joey Over a year ago

indeed, but to a first approximation Explorer is about the only process that does that.

Ulysses · Accepted Answer · 2016-06-06 16:47:07Z

0

catch {exec cmd /C "setX $variable_name $valueToSet"}

answered Jun 6, 2016 at 16:47

Ulysses

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