Not working well

[Deleted user]

  var home = '/home/foo/';
  var path = '/bar';
  var absolutePath = p.join(home, path);
  // got /bar
  print(absolutePath); 

[natebosch]

/bar is already an absolute path. See the docs for join which say:

If a part is an absolute path, then anything before that will be ignored

https://pub.dev/documentation/path/latest/path/join.html

You want

var home = '/home/foo';
var path = 'bar'
var absolutePath = p.join(home, path);