script, that moves windows to another monitor, when the lid of the notebook is closed. Run with `watch -n 0.5 ./lid.sh`

lid.sh

#!/usr/bin/env bash
LID_TMP='/tmp/lidscript.tmp'

# Read hoved windows from file
readarray moved_windows < $LID_TMP
# remove newlines after every element...
newMovedWindows=()
for i in "${!moved_windows[@]}"; do
    without_newline=${moved_windows[$i]%$'\n'}
    if [[ $without_newline != "" ]]; then
        newMovedWindows+=("$without_newline")
        echo "Moved Window: $without_newline"
    fi
done
moved_windows=("${newMovedWindows[@]}")

function monitors() {
    # Get Names of monitors
    PRIMARY_MONITOR=$(xrandr | grep ' connected primary' | cut -d " " -f1)
    OTHER_MONITORS=$(xrandr | grep ' connected [0-9]' | cut -d " " -f1)
    for monitor in $OTHER_MONITORS ; do
        OTHER_MONITOR="$monitor"
    done
}

monitors

echo "Primary monitor: $PRIMARY_MONITOR"


I3WSS=$(i3-msg -t get_workspaces)

# Get Names of currently active workspace on both monitors
NOTEBOOK_WS=$(echo "${I3WSS}" |
    jq ".[]
    | select(.visible==true)
    | select(.output==\"$PRIMARY_MONITOR\")
    | .name")
OTHER_WS=$(echo "${I3WSS}" |
    jq ".[]
    | select(.visible==true)
    | select(.output==\"$OTHER_MONITOR\")
    | .name")
# Get windows on active notebook monitor
NB_WINDOWS=$(i3-msg -t get_tree |
    jq ".. | objects | select(.name== $NOTEBOOK_WS)
    | .[\"nodes\"]
    | map(.id)
    | .[]")

function moveToExternalMonitor() {
    for window in $NB_WINDOWS; do
        i3-msg "[con_id=\"$window\"] focus"
        i3-msg move container to workspace "$OTHER_WS"
        moved_windows+=("$window")
    done
}

function moveBack() {
    for i in "${!moved_windows[@]}"; do
        i3-msg "[con_id=\"${moved_windows[$i]}\"] focus"
        i3-msg move container to workspace "$NOTEBOOK_WS"
        moved_windows=( "${moved_windows[@]/${moved_windows[$i]}}" )
    done
}

function lidCheck() {
    LID_OPEN=$(grep open /proc/acpi/button/lid/LID/state)
    echo "X${LID_OPEN}X"
    if [ -n "$LID_OPEN" ]; then
        echo 'lid open'
        moveBack
    else
        echo 'lid closed'
        moveToExternalMonitor
    fi
}

lidCheck

echo before
cat $LID_TMP

# save moved windows to tmp file
printf "%s\n" "${moved_windows[@]}" > $LID_TMP

echo after
cat $LID_TMP