Update domainjoin.sh

domainjoin.sh

@@ -1,18 +1,18 @@
 #!/bin/bash
 
-if [[ "$EUID" -ne 0 ]]; then
+if [ "$EUID" -ne 0 ]; then
   echo "Please run as root"
   exit
 fi
 
-if [[ -f /etc/debian_version ]]; then
+if [ -f /etc/debian_version ]; then
     wget -O - http://repo.pbis.beyondtrust.com/apt/RPM-GPG-KEY-pbis|sudo apt-key add - 
     wget -O /etc/apt/sources.list.d/pbiso.list http://repo.pbis.beyondtrust.com/apt/pbiso.list 
     apt update
     apt install -y pbis-open
 fi
 
-if [[ -f /etc/redhat-release ]]; then
+if [ -f /etc/redhat-release ]; then
     wget -O /etc/yum.repos.d/pbiso.repo http://repo.pbis.beyondtrust.com/yum/pbiso.repo
     yum clean all
     yum install pbis-open