add string

@echo off

rem %1 - file in device /system folder
rem %2 - search regular expression
rem %3 - replace string

echo Remount system rw ...
adb shell su -c "mount -o rw,remount /system" 
adb shell cd /sdcard
echo Copy %1 from system to sdcard ...
adb shell su -c "cp /system/%1 /sdcard/%1"

echo Get %1 file from device ...
adb pull -p /sdcard/%1 %1

echo Change density ....
rxrepl -f "%1" -o "%1" -s "%2" -i -r "%3" -a --no-backup
find "qemu.hw.mainkeys=1" "%1" 1>nul || echo qemu.hw.mainkeys=1 >> "%1"

echo Send %1 file to device ...
adb push -p %1 /sdcard/%1

echo Copy %1 from sdcard to system ...
adb shell su -c "cp /sdcard/%1 /system/%1"

echo Remove temporary copy %1 from sdcard ...
adb shell rm /sdcard/%1

del %1