addToPATH method
Adds the given path to the bash path if it isn't already on teh path.
Implementation
@override
bool addToPATH(String path) {
if (!isOnPATH(path)) {
final export = 'export PATH=\$PATH:$path';
final rcPath = pathToStartScript;
if (!exists(rcPath)) {
rcPath.write(export);
} else {
rcPath.append(export);
}
}
return true;
}