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This command will get the PID of the xterm process launched:
xterm & export APP_PID=$!
How can I get the window ID associated to that process (the xterm window ID)? I mean, the ID that xdotool selectwindow would return after clicking on the xterm window.
You can get the list of matching windows via
xdotool search --pid [pid]
also see xdotool help search
I will use this simple command to get the window ID in hex format
wmctrl -l | grep -i xterm | awk '{print $1}'
For decimal format, bc command can be used for conversion
echo "ibase=16; `wmctrl -l | grep -i xterm | cut -c 3-11 | tr a-z A-Z`" | bc
wmctrl -l doesn't give useful results if your xterm window title has been set, e.g., to a string which does not contain "xterm".
Nov 7, 2016 at 0:34
-p gives PID, -G gives position and dimensions. In my case, wmctrl -l -p | { pidof firefox vlc | read line && grep ${line// /\\|} }, and optionally go straight for xwininfo from there: | while read id junk; do xwininfo -id $id; done. I'm using zsh, I'm not sure if that regex is fully portable.
It's been discussed in the "other" forum:
In the first, @Patrick points out that xwininfo can return information on all windows, and by using xprop for each window, you can check for the _NET_WM_PID property, matching it against your process-id.
win=$(sed -zn < /proc/$APP_PID/environ 's/^WINDOWID=\(.*\)/\1/p')
WINDOWID is a terminal emulator convention (probably from xterm in X10R4, 1986, yes X10, not a typo) not a general X application one; like _NET_WM_PID is a wm-spec convention (since a 1999 draft) that not all terminals follow. Even some modern terminal emulators don't always set WINDOWID. It is also the case that non-terminal processes can inherit it via a parent shell. Beware poking in environ files ;-)
Nov 7, 2018 at 12:26