appendToPATH method
Appends the given path to the bash path if it isn't already on the path.
Implementation
@override
bool appendToPATH(String path) {
// ignore: flutter_style_todos
/// TODO(bsutton): check if there is already an export
/// for dcli path.
if (!isOnPATH(path)) {
final export = 'export PATH=\$PATH:$path';
_updatePATH(export);
}
return true;
}