How to find how many windows are opened in GNU screen

As far as I am aware, this is not possible using screen, but you could use reptyr to reassign the program to a new terminal.

Here is some useful guidance on using reptyr:

• Attach running process to new terminal -- you probably want to read this, it should help you assign the program to screen
• Change process' controlling terminal

You could also look at using the slightly less complex grab.c.

I found this early on in RHEL 7 testing and it would drive me nuts. What I discovered is that there was a change to /etc/bashrc in RHEL 7 that causes the naming of windows in screen and tmux to change whenever a command like cd or ls is run. In section screen*)

if [ -e /etc/sysconfig/bash-prompt-screen ]; then
    PROMPT_COMMAND=/etc/sysconfig/bash-prompt-screen
else
## RHEL 7
    PROMPT_COMMAND='printf "\033k%s@%s:%s\033\\" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"'

## RHEL 6
    PROMPT_COMMAND='printf "\033]0;%s@%s:%s\033\\" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"'
fi

So in RHEL 7 the change was from ]0; to k in the PROMPT_COMMAND section.

I had considered opening a bug, but just never got around to it. I usually just change it manually on a fresh install.

• Changes made to update formatting