Shell Programming and Scripting

if [ $# -eq 0 ]
then
echo -e " Please enter minimum 1 arguement seperated by space. \n Example: BASIC,IMM etc."
else
case "$1" in
ICP) echo -e "Welcome to ICP"
     
     gw_user=(icpct_gw) # arrays username
     gui_user=(icpct_ui)
     gw_host=(ston160)
     gui_host=(ston260)  # arrays hostname

     echo "Please enter where you want to sync?.. Example: For gateway enter GW, gui enter GUI and for entire ICP enter ALL"
     read x

        if [ "$x" == 'GW' ]
        then
        #echo "Successful"
        for (( i = 0 ; i <= 1 ; i++ ))
        do
        ssh ${gw_user[$i]}@${gw_host[$i]} mkdir DEPLOYTOOL/test
        done

        fi    
      
;;
*) echo -e "Please enter valid input. \n Example: BASIC,IMM etc."
;;
esac
fi

# ./1sync.sh ICP

# ./1sync.sh: line 25: syntax error near unexpected token `(('
# ./1sync.sh: line 25: `        for (( i = 0 ; i <= 1 ; i++ ))'

sh -x ./1sync.sh ICP
./1sync.sh: syntax error at line 14: `gw_user=' unexpected

echo $SHELL

#!/usr/bin/env bash
#!/usr/bin/env ksh

i=0
while [ $i -le 1 ]
do
  ssh ${gw_user[$i]}@${gw_host[$i]} mkdir DEPLOYTOOL/test
  let i=i+1
done