gistfile1.txt

$ tmuxa
Traceback (most recent call last):
  File "/home/anddam/.local/lib/python3.5/site-packages/xonsh/__amalgam__.py", line 12437, in run
    r = self.f(self.args, sp_stdin, sp_stdout, sp_stderr, spec)
  File "/home/anddam/.local/lib/python3.5/site-packages/xonsh/__amalgam__.py", line 12266, in proxy_two
    return f(args, stdin)
  File "/home/anddam/.xonshrc", line 30, in _tmuxa
    ![tmux attach] || ![tmux new-session]
  File "/home/anddam/.local/lib/python3.5/site-packages/xonsh/__amalgam__.py", line 18340, in subproc_captured_hiddenobject
    return run_subproc(cmds, captured='hiddenobject')
  File "/home/anddam/.local/lib/python3.5/site-packages/xonsh/__amalgam__.py", line 18281, in run_subproc
    command = HiddenCommandPipeline(specs)
  File "/home/anddam/.local/lib/python3.5/site-packages/xonsh/__amalgam__.py", line 12859, in __init__
    if update_fg_process_group(pipeline_group, background):
  File "/home/anddam/.local/lib/python3.5/site-packages/xonsh/__amalgam__.py", line 12795, in update_fg_process_group
    return give_terminal_to(pipeline_group)
  File "/home/anddam/.local/lib/python3.5/site-packages/xonsh/__amalgam__.py", line 8901, in give_terminal_to
    os.tcsetpgrp(sys.stderr.fileno(), pgid)
OSError: [Errno 25] Inappropriate ioctl for device
no sessions

xonshrc.py

# Aliases

def _tmuxa(args, stdin=None):
    "Attach to existing tmux session or create a new one"
    if len(args) > 0:
        ![tmux attach -t @(args[0])] || ![tmux new-session -s @(args[0])]
    else:
        ![tmux attach] || ![tmux new-session]

aliases['tmuxa'] = _tmuxa