#!/bin/bash
echo "this"$1
sleep 30

C:cygwin64binbash.exe --login -i '/cygdrive/c/cygwin64/echo.sh'

C:cygwin64binbash.exe --login -i '/cygdrive/c/cygwin64/echo.sh $1' #file not found
C:cygwin64binbash.exe --login -i '/cygdrive/c/cygwin64/echo.sh' $1 #prints 'this$1'

C:cygwin64binbash.exe --login -i '/cygdrive/c/cygwin64/echo.sh' %1