reptyr

Attach process to current terminal

$ reptyr [pid]

$ reptyr $(pidof [htop])

reptyr [-s] [-T] pid

reptyr moves a running process to a new terminal. This is invaluable when you start a long-running command in a regular terminal and later realize it should be in screen or tmux.
The tool uses ptrace to reparent the process's controlling terminal, allowing it to receive input from and send output to the new terminal.

-s

Attach via script method (more compatible)

Attach process and its children

List PIDs that can be attached

Verbose output

Process ID to attach

Requires ptrace capability (may need root or sysctl adjustment). Some processes may not work due to terminal state. Background the process first with Ctrl+Z and bg. Process must be owned by current user.

reptyr was created by Nelson Elhage to solve the common problem of wanting to move a running process to a different terminal or screen session without restarting it.

screen(1), tmux(1), nohup(1), disown(1)