Update rmmagent-linux.sh

rmmagent-linux.sh

@@ -1,12 +1,12 @@
-#!/bin/bash
+#!/bin/ash
 
-if [[ $1 == "" ]]; then
+if [ "$1" = "" ]; then
   echo "First argument is empty!"
   echo "Type help for more information"
   exit 1
 fi
 
-if [[ $1 == "help" ]]; then
+if [ "$1" = "help" ]; then
   echo "There is help but more information is available at github.com/ZoLuSs/rmmagent-script"
   echo ""
   echo "INSTALL args:"
@@ -29,7 +29,7 @@ if [[ $1 == "help" ]]; then
   exit 0
 fi
 
-if [[ $1 != "install" && $1 != "update" && $1 != "uninstall" ]]; then
+if [ "$1" != "install" ] && [ "$1" != "update" ] && [ "$1" != "uninstall" ]; then
   echo "First argument must be 'install', 'update', or 'uninstall'!"
   echo "Type help for more information"
   exit 1
@@ -61,7 +61,7 @@ go_url_arm64="https://go.dev/dl/go$go_version.linux-arm64.tar.gz"
 go_url_armv6="https://go.dev/dl/go$go_version.linux-armv6l.tar.gz"
 
 go_install() {
-  if ! command -v go &> /dev/null; then
+  if ! command -v go >/dev/null 2>&1; then
     case $system in
       amd64) url=$go_url_amd64 ;;
       x86) url=$go_url_x86 ;;
@@ -82,7 +82,7 @@ agent_compile() {
   wget -O /tmp/rmmagent.tar.gz "https://github.com/amidaware/rmmagent/archive/refs/heads/master.tar.gz"
   tar -xf /tmp/rmmagent.tar.gz -C /tmp/
   rm /tmp/rmmagent.tar.gz
-  cd /tmp/rmmagent-master
+  cd /tmp/rmmagent-master || exit 1
   case $system in
     amd64) arch=amd64 ;;
     x86) arch=386 ;;
@@ -101,7 +101,7 @@ install_agent() {
     -site-id "$rmm_site_id" -agent-type "$rmm_agent_type" -auth "$rmm_auth"
   
   # Create OpenRC service script
-  cat << "EOF" > /etc/init.d/tacticalagent
+  cat << 'EOF' > /etc/init.d/tacticalagent
 #!/sbin/openrc-run
 
 description="Tactical RMM Linux Agent"
@@ -173,4 +173,4 @@ case $1 in
     echo "Tactical Agent Uninstall is done"
     exit 0
     ;;
-esac
+esac