diff --git a/installers/common.sh b/installers/common.sh
index 6f120c7..ce691ab 100644
--- a/installers/common.sh
+++ b/installers/common.sh
@@ -48,16 +48,16 @@ function install_dependencies() {
 # Verifies existence of or adds user for Minecraft server (default "minecraft")
 function add_minecraft_user() {
     install_log "Creating default user '$msm_user'"
-    useradd --system --user-group $msm_user
+    sudo useradd $msm_user || install_error "Couldn't create server user"
 }
 
 # Verifies existence and permissions of msm server directory (default /opt/msm)
 function create_msm_directories() {
     install_log "Creating MSM directories"
     if [ ! -d "$msm_dir" ]; then
-        mkdir -p "$msm_dir" || install_error "Couldn't create directory '$msm_dir'"
+        sudo mkdir -p "$msm_dir" || install_error "Couldn't create directory '$msm_dir'"
     fi
-    chown -R $msm_user:$msm_user "$msm_dir" || install_error "Couldn't change file ownership for '$msm_dir'"
+    sudo chown -R $msm_user:$msm_user "$msm_dir" || install_error "Couldn't change file ownership for '$msm_dir'"
 }
 
 # Fetches latest msm.conf, cron job, and init script
@@ -67,15 +67,15 @@ function download_latest_files() {
     fi
 
     install_log "Downloading latest MSM configuration file"
-    wget https://raw.github.com/marcuswhybrow/minecraft-server-manager/latest/msm.conf \
+    sudo wget https://raw.github.com/marcuswhybrow/minecraft-server-manager/latest/msm.conf \
         -O "$dl_dir/msm.conf.orig" || install_error "Couldn't download configuration file"
 
     install_log "Downloading latest MSM cron file"
-    wget https://raw.github.com/marcuswhybrow/minecraft-server-manager/latest/cron/msm \
+    sudo wget https://raw.github.com/marcuswhybrow/minecraft-server-manager/latest/cron/msm \
         -O "$dl_dir/msm.cron.orig" || install_error "Couldn't download cron file"
 
     install_log "Downloading latest MSM version"
-    wget https://raw.github.com/marcuswhybrow/minecraft-server-manager/latest/init/msm \
+    sudo wget https://raw.github.com/marcuswhybrow/minecraft-server-manager/latest/init/msm \
         -O "$dl_dir/msm.init.orig" || install_error "Couldn't download init file"
 }
 
@@ -83,23 +83,23 @@ function download_latest_files() {
 function patch_latest_files() {
     # patch config file
     install_log "Patching MSM configuration file"
-    sed 's#USERNAME="minecraft"#USERNAME="'$msm_user'"#g' "$dl_dir/msm.conf.orig" | \
+    sudo sed 's#USERNAME="minecraft"#USERNAME="'$msm_user'"#g' "$dl_dir/msm.conf.orig" | \
         sed "s#/opt/msm#$msm_dir#g" >"$dl_dir/msm.conf"
 
     # patch cron file
     install_log "Patching MSM cron file"
-    awk '{ if ($0 !~ /^#/) sub(/minecraft/, "'$msm_user'"); print }' \
+    sudo awk '{ if ($0 !~ /^#/) sub(/minecraft/, "'$msm_user'"); print }' \
         "$dl_dir/msm.cron.orig" >"$dl_dir/msm.cron"
 
     # patch init file
     install_log "Patching MSM init file"
-    cp "$dl_dir/msm.init.orig" "$dl_dir/msm.init"
+    sudo cp "$dl_dir/msm.init.orig" "$dl_dir/msm.init"
 }
 
 # Installs msm.conf into /etc
 function install_config() {
     install_log "Installing MSM configuration file"
-    install -b -m0644 "$dl_dir/msm.conf" /etc/msm.conf
+    sudo install -b -m0644 "$dl_dir/msm.conf" /etc/msm.conf
     if [ ! -e /etc/msm.conf ]; then
         install_error "Couldn't install configuration file"
     fi
@@ -108,7 +108,7 @@ function install_config() {
 # Installs msm.cron into /etc/cron.d
 function install_cron() {
     install_log "Installing MSM cron file"
-    install "$dl_dir/msm.cron" /etc/cron.d/msm || install_error "Couldn't install cron file"
+    sudo install "$dl_dir/msm.cron" /etc/cron.d/msm || install_error "Couldn't install cron file"
 }
 
 # Reloads cron service (if necessary)
@@ -120,10 +120,10 @@ function reload_cron() {
 # Installs init script into /etc/init.d
 function install_init() {
     install_log "Installing MSM init file"
-    install -b "$dl_dir/msm.init" /etc/init.d/msm || install_error "Couldn't install init file"
+    sudo install -b "$dl_dir/msm.init" /etc/init.d/msm || install_error "Couldn't install init file"
 
     install_log "Making MSM accessible as the command 'msm'"
-    ln -s /etc/init.d/msm /usr/local/bin/msm
+    sudo ln -s /etc/init.d/msm /usr/local/bin/msm
 }
 
 # Enables init script in default runlevels
@@ -135,7 +135,7 @@ function enable_init() {
 # Updates rest of MSM using init script updater
 function update_msm() {
     install_log "Asking MSM to update itself"
-    /etc/init.d/msm update --noinput
+    sudo /etc/init.d/msm update --noinput
 }
 
 function install_complete() {
@@ -143,30 +143,18 @@ function install_complete() {
 }
 
 function install_msm() {
-    echo "This script requires superuser access to install files to /etc."
-    echo "You will be prompted for your password by sudo."
-
-    # Clear existing sudo credentials
-    sudo -k
-
-    # Run install functions as sudo
-    # These functions are defined in another script
-    # after which this script is sourced
-    sudo sh <<SCRIPT
-        config_installation
-        update_system_packages
-        install_dependencies
-        add_minecraft_user
-        create_msm_directories
-        download_latest_files
-        patch_latest_files
-        install_config
-        install_cron
-        reload_cron
-        install_init
-        enable_init
-        update_msm
-        install_complete
-SCRIPT
-
+    config_installation
+    add_minecraft_user
+    update_system_packages
+    install_dependencies
+    create_msm_directories
+    download_latest_files
+    patch_latest_files
+    install_config
+    install_cron
+    reload_cron
+    install_init
+    enable_init
+    update_msm
+    install_complete
 }
diff --git a/installers/debian.sh b/installers/debian.sh
index bb03f7e..dc404f8 100755
--- a/installers/debian.sh
+++ b/installers/debian.sh
@@ -1,25 +1,23 @@
-wget -q https://raw.github.com/marcuswhybrow/minecraft-server-manager/master/installers/common.sh -O /tmp/msmcommon.sh
-source /tmp/msmcommon.sh
-rm -f /tmp/msmcommon.sh
+source <(wget -qO- https://raw.github.com/marcuswhybrow/minecraft-server-manager/master/installers/common.sh)
 
 function update_system_packages() {
     install_log "Updating sources"
-    apt-get update || install_error "Couldn't update package list"
-    apt-get upgrade || install_error "Couldn't upgrade packages"
+    sudo apt-get update || install_error "Couldn't update package list"
+    sudo apt-get upgrade || install_error "Couldn't upgrade packages"
 }
 
 function install_dependencies() {
     install_log "Installing required packages"
-    apt-get install screen rsync zip || install_error "Couldn't install dependencies"
+    sudo apt-get install screen rsync zip || install_error "Couldn't install dependencies"
 }
 
 function reload_cron() {
     install_log "Reloading cron service"
     hash service 2>/dev/null
     if [[ $? == 0 ]]; then
-        service cron reload
+        sudo service cron reload
     else
-        /etc/init.d/cron reload
+        sudo /etc/init.d/cron reload
     fi
 }
 
@@ -27,10 +25,10 @@ function enable_init() {
     install_log "Enabling automatic startup and shutdown"
     hash insserv 2>/dev/null
     if [[ $? == 0 ]]; then
-        insserv msm
+        sudo insserv msm
     else
-        update-rc.d msm defaults
+        sudo update-rc.d msm defaults
     fi
 }
 
-install_msm
+install_msm
\ No newline at end of file
diff --git a/installers/redhat.sh b/installers/redhat.sh
index 3e1a73c..f4338ea 100644
--- a/installers/redhat.sh
+++ b/installers/redhat.sh
@@ -1,25 +1,23 @@
-wget -q https://raw.github.com/marcuswhybrow/minecraft-server-manager/master/installers/common.sh -O /tmp/msmcommon.sh
-source /tmp/msmcommon.sh
-rm -f /tmp/msmcommon.sh
+source <(wget -qO- https://raw.github.com/marcuswhybrow/minecraft-server-manager/master/installers/common.sh)
 
 function update_system_packages() {
     install_log "Updating sources"
-    yum update || install_error "Couldn't update packages"
+    sudo yum update || install_error "Couldn't update packages"
 }
 
 function install_dependencies() {
     install_log "Installing required packages"
-    yum install screen rsync zip || install_error "Couldn't install dependencies"
+    sudo yum install screen rsync zip || install_error "Couldn't install dependencies"
 }
 
 function reload_cron() {
     install_log "Reloading cron service"
-    service crond reload
+    sudo service crond reload
 }
 
 function enable_init() {
     install_log "Enabling automatic startup and shutdown"
-    chkconfig --add msm
+    sudo chkconfig --add msm
 }
 
 install_msm