![]() ![]() This flag indicates that a path should be translated between WSL paths and Win32 paths. There are four flags you can use to influence how they’re translated. An example definition could be something like this: WSLENV=HOME/w:GOPATH/l:TMPDIR/p … A user sets the value of WSLENV to a concatenation of several other already-defined environment vars, each suffixed with a slash followed by flags to specify how the value should be translated. WSLENV is shared it exists in both environments. We’re introducing a special environmental var named WSLENV to assist in the flow between WSL and Win32. WSL and environment variables - after Insider 17063 Since passing environment vars to processes is a common practice and we received plenty of feedback concerning how this was a pain point for our users, we wanted to make this a better experience. Given these limitations, you couldn’t pass an environment var in WSL to a Win32 process without jumping though convoluted hoops. But there was no way to set an environment variable in WSL, invoke a Win32 process, and expect for that variable to be fed through to the process. Prior to 17063, the only Windows environment variable that WSL had access to was PATH (so you could launch Win32 executables from under WSL). Referencing environment variables from *both *Windows and WSL introduces interop issues. WSL and environment variables - before Insider 17063 The image above has PATH printed to the console-and you’ll notice that the last entry in PATH points to a directory which does in fact contain Node. If it finds it, it stop the search immediately and invokes the executable it found. ![]() When I enter this command, cmd reads the contents of PATH, searching for a directory that contains the executable “node.exe”. I’m about to invoke Node from the command line. Here’s a common example of how PATH is used: Much like the name implies, PATH contains a list of directories (paths) separated by a semi-colon which point to the locations of numerous executables. Who sets these values? You can, newly installed software on your system can, or Windows has set some of them.Īn example of a well-known environmental variable is PATH. ![]() Notice the wide range of values in the example above-lists of directories, software versions, locations where temporary files are permitted to be stored, and more. It will show a window like the one below: On Windows, you can find your environmental variables by going to “Edit environment variables for your account” in the Control Panel. bashrc or in the custom Windows environment for your userĪ sample of how a WSLENV could possibly look: WSLENV=GOPATH/l:USERPROFILE/w:SOMEVAR/wpĮnvironment variables are a way to store configurable values across your entire system-all your programs have access to these. The value should only be included when invoking Win32 from WSL.The value should only be included when invoking WSL from Win32.In Win32, it is a semicolon-delimited list The value is a path that should be translated between WSL paths and Win32 paths.Each variable can be suffixed with a slash followed by flags to specify how it is translated. ![]() WSLENV is a colon-delimited list of environment variables that should be included when launching WSL processes from Win32 or Win32 processes from WSL.Summaryįor the pros who’ve already heard about WSLENV and just want to know how it works, see below for a quick synopsis: Starting with Build 17063, let’s look at how you can leverage the new “WSLENV” to enhance environmental variable interop between Win32/WSL. Hey WSL users-we have more features to share with you! Our latest Windows Insider build lets you share environment variables between WSL and Windows. ![]()
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