unsetenv(1)                                                 unsetenv(1)

  unsetenv

  NAME

    unsetenv - remove environment variables

  SYNOPSIS

    unsetenv pattern

  DESCRIPTION

    This command is a C-shell built-in command.

    The unsetenv(1) command removes all environment variables whose names
    match pattern. Thus, 'unsetenv *' removes all environment variables; this
    is not recommended. It is not an error if no environment variables are
    removed.