### Function

# GLib unsetenv

since: 2.4

#### Declaration

    void
    g_unsetenv (
      const gchar* variable
    )

#### Description

Removes an environment variable from the environment.

Note that on some systems, when variables are overwritten, the memory used for the previous variables and its value isn’t reclaimed.

You should be mindful of the fact that environment variable handling in UNIX is not thread-safe, and your program may crash if one thread calls `g_unsetenv()` while another thread is calling getenv(). (And note that many functions, such as gettext(), call `getenv()` internally.) This function is only safe to use at the very start of your program, before creating any other threads (or creating objects that create worker threads of their own).

If you need to set up the environment for a child process, you can use `g_get_environ()` to get an environment array, modify that with `g_environ_setenv()` and g_environ_unsetenv(), and then pass that array directly to execvpe(), g_spawn_async(), or the like.

Available since: 2.4

#### Parameters

`variable`

  Type: `const gchar*`

  The environment variable to remove, must not contain ‘=’

  The data is owned by the caller of the function.
  The value is a file system path, using the OS encoding.