Migrate a running process into tmux

reptyr is a utility for taking an existing running program and attaching it to a new terminal. Started a long-running process over ssh, but have to leave and don’t want to interrupt it? Just start a screen, use reptyr to grab it, and then kill the ssh session and head on home.

sudo apt-get install -y reptyr    # For Ubuntu users

Send the current foreground job to the background using CTRL-Z.

List all the background jobs using jobs -l. This will get you the PID.

jobs -l
 [1]  + 16189 suspended  vim foobar.rst

Here the PID is 16189.
Start a new tmux or screen session. I will be using tmux:

tmux

Reattach the background process using:

reptyr 16189

If this error appears:

Unable to attach to pid 16189: Operation not permitted
 The kernel denied permission while attaching

Then type in the following command as root.

echo 0 > /proc/sys/kernel/yama/ptrace_scope

#reptyr #tmux #screen #pid