Runcommand + runcommand-onstart.sh script

Lupin

Pi Model 3 B
RetroPie Version: 4.3.8 + running emulation station
USB Devices connected: Wifi Keyboard, 2 x Zero_Delay Arcade Interface
Using windows +Notepad and SSH to transfer files to Pi.

Trying to get runcommand-onstart.sh to work:
#!/usr/bin/env bash

system="$1"
emulator="$2"

if [[ "$emulator" == "playback" ]]; then
/opt/retropie/supplementary/runcommand/joy2key.py /dev/input/js0 kcub1 kcuf1 kcuu1 kcud1 0x70 0x71 &
fi

Wanted to use joy2key.py to program joystick with basic key controls for OMXPlayer when "playback" emulator selected.
Runcommand passed as arguments to these scripts:
$1 - the system (eg: atari2600, nes, snes, megadrive, fba, etc).
$2 - the emulator (eg: lr-stella, lr-fceumm, lr-picodrive, pifba, etc).
$3 - the full path to the rom file.
$4 - the full command line used to launch the emulator.

But error log showing:
/opt/retropie/configs/all/runcommand-onstart.sh: line 2: $'\r': command not found
/opt/retropie/configs/all/runcommand-onstart.sh: line 5: $'\r': command not found
/opt/retropie/configs/all/runcommand-onstart.sh: line 11: syntax error: unexpected end of file
Parameters:
Executing: omxplayer -r -o both "/home/pi/RetroPie/roms/video.mp4"
Video codec omx-h264 width 1280 height 720 profile 100 fps 30.000000
Audio codec aac channels 2 samplerate 44100 bitspersample 16
Subtitle count: 0, state: off, index: 1, delay: 0
V:PortSettingsChanged: 1280x720@30.00 interlace:0 deinterlace:0 anaglyph:0 par:1.00 display:0 layer:0 alpha:255 aspectMode:0
Stopped at: 00:00:02
have a nice day ;)

I should have been able to bug check this, but can not even run example script listed here without similar errors (METHOD 1):
https://github.com/RetroPie/RetroPie-Setup/wiki/Take-and-Scrape-Your-Own-Screenshots

Checked runcommand-onend.sh running ok and stopping joy2key.py:
#!/usr/bin/env bash

killall joy2key.py

But can not make mistake on 1 line :)

Can anyone help with correcting script (Then line wrong for SURE) and why example script also will not run?

mitu

@lupin Check if you script has UNIX end-of-line, instead of DOS - https://superuser.com/questions/479756/eol-in-notepad-and-notepad.