comparison for if statement not returning value

am creating a script to validate what the centos version is running on several VMs, here is the script am using for testing:

#testing script
#commands
cmd1= cat /etc/system-release | grep "7." | wc -l
cmd2= cat /etc/system-release | grep "6." | wc -l

#creating Function
function os_check(){
    echo "#######"
    echo "The VM $server is running on: "
    if [$cmd1 -ne 0]; then
        echo "Centos 7"   
    elif [$cmd2 -ne 0]; then
        echo "Centos 6"
    else
        echo "Something went wrong"
    fi
    echo "#######"
}

#running function
os_check

but am getting the following error:

./checking.sh: line 10: [: missing `]'
./checking.sh: line 12: [: missing `]'

made some changes to the code:

#!/bin/bash 
#testing script 
#commands server= $(hostname) 
cmd1= $(cat /etc/*-release | grep "7." | wc -l) 
cmd2= $(cat /etc/*-release | grep "6." | wc -l) 
#creatingFunction 
function os_check(){ 
   echo "#######-OS_Checker-#######" 
   echo "The VM $server is running on: " 
   if [ $cmd1 -ne 0 ]; then 
       echo "Centos 7" 
   elif [ $cmd2 -ne 0 ]; then
       echo "Centos 6" 
   else 
       echo "Something went wrong" 
   fi 
   echo "##########################" } 
#running function 
os_check

but receiving the following error:

user@server-name:[~]:$ ./checking.sh
./checking.sh: line 5: tordzabbixap1.sandals.com: command not found
./checking.sh: line 6: 1: command not found
./checking.sh: line 7: 0: command not found
#######-OS_Checker-#######
The VM  is running on: 
./checking.sh: line 13: [: : integer expression expected
./checking.sh: line 15: [: : integer expression expected
Something went wrong
##########################