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A tiny script to set the transparency for X windows. If AUTOMAGIC_MODE is "true", it tries to find all gnome-terminal windows and applies the transparency to all of them.

View set_gnome-terminal_transparency.sh
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#!/bin/bash
# vim: set sts=4 sw=4 et tw=0 :
#
# License: BSD
 
AUTOMAGIC_MODE="true"
OPACITY_100="0xffffffff"
OPACITY_0="0x0"
 
: ${XWININFO:=$(type -P xwininfo)}
[[ -z ${XWININFO} ]] && { echo "You need to install xwininfo"; exit 1; }
: ${XPROP:=$(type -P xprop)}
[[ -z ${XPROP} ]] && { echo "You need to install xprop"; exit 1; }
 
TRANSPARENCY_PERCENT=$1
[[ -z "${TRANSPARENCY_PERCENT}" ]] && { echo "Usage: $0 <transparency in percentage>"; exit 1; }
 
if [[ ${AUTOMAGIC_MODE} != true ]]; then
echo "Click on a terminal window to set its transparency as specified (${TRANSPARENCY_PERCENT}%)"
TERMINAL_WINDOW_XID=$("$XWININFO" | sed -n 's/.*Window id: \([0-9a-fx]\+\).*/\1/p')
else
# This is very fragile
TERMINAL_WINDOW_XID=$("$XWININFO" -root -tree | grep -v "Terminal" | sed -n 's/^[[:space:]]\+\([0-9a-fx]\+\).*gnome-terminal.*/\1/p')
fi
 
if [[ $TRANSPARENCY_PERCENT = 100 ]]; then
TRANSPARENCY_HEX="$OPACITY_100"
elif [[ $TRANSPARENCY_PERCENT = 0 ]]; then
TRANSPARENCY_HEX="$OPACITY_0"
else
TRANSPARENCY_HEX=$(printf "0x%x" $((($(printf "%d" $OPACITY_100) * $TRANSPARENCY_PERCENT)/100)))
fi
 
echo "Setting transparency to $TRANSPARENCY_HEX (${TRANSPARENCY_PERCENT}%)"
for each in $TERMINAL_WINDOW_XID; do
"$XPROP" -id $each -f _NET_WM_WINDOW_OPACITY 32c -set _NET_WM_WINDOW_OPACITY $TRANSPARENCY_HEX
done
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