diff --git a/attach b/attach
index 32b181b1..15b368e1 100755
--- a/attach
+++ b/attach
@@ -1,9 +1,15 @@
 #!/usr/bin/env bash
 
-RUNUSER="sudo -u $(logname)"
+RUNUSER="sudo -u $SUDO_USER"
+
+if [ -z "$SUDO_USER" ]; then
+    echo This script may not be run without sudo!
+    exit
+fi
+
 $RUNUSER bash ./scripts/updater --autoupdater
 
-line=$(pgrep -u $(logname) hl2_linux)
+line=$(pgrep -u $SUDO_USER hl2_linux)
 arr=($line)
 inst=$1
 if [ $# == 0 ]; then
diff --git a/attach-gdb b/attach-gdb
index 29cf5932..4d0b3b47 100755
--- a/attach-gdb
+++ b/attach-gdb
@@ -1,6 +1,12 @@
 #!/usr/bin/env bash
 
-RUNUSER="sudo -u $(logname)"
+RUNUSER="sudo -u $SUDO_USER"
+
+if [ -z "$SUDO_USER" ]; then
+    echo This script may not be run without sudo!
+    exit
+fi
+
 $RUNUSER bash ./scripts/updater --autoupdater
 
 line=$(pgrep -u $SUDO_USER hl2_linux)
diff --git a/attach-libnamed.sh b/attach-libnamed.sh
index 53bfb4b8..b113cf04 100755
--- a/attach-libnamed.sh
+++ b/attach-libnamed.sh
@@ -3,7 +3,13 @@
 # Thank you LWSS
 # https://github.com/LWSS/Fuzion/commit/a53b6c634cde0ed47b08dd587ba40a3806adf3fe
 
-RUNUSER="sudo -u $(logname)"
+RUNUSER="sudo -u $SUDO_USER"
+
+if [ -z "$SUDO_USER" ]; then
+    echo This script may not be run without sudo!
+    exit
+fi
+
 $RUNUSER bash ./scripts/updater --autoupdater
 
 line=$(pgrep -u $SUDO_USER hl2_linux)
diff --git a/install-data b/install-data
index b200f103..a0188dc4 100755
--- a/install-data
+++ b/install-data
@@ -1,14 +1,15 @@
 #!/usr/bin/env bash
 
+[[ ! -z "$SUDO_USER" ]] && user=$SUDO_USER || user=$LOGNAME
 if ! [ -d "/opt/cathook/data" ]; then
     echo "Creating cathook data directory at /opt/cathook/data"
     mkdir -p "/opt/cathook/data"
-    chown -R $USER "/opt/cathook/data"
+    chown -R $user "/opt/cathook/data"
     chmod -R 777 "/opt/cathook/data"
 fi
 
 echo "Installing cathook data to /opt/cathook/data"
 rsync -avh --progress "data/" "/opt/cathook/data"
 rsync -avh --ignore-existing --progress "config_data/" "/opt/cathook/data"
-chown -R $(logname) "/opt/cathook/data"
+chown -R $user "/opt/cathook/data"
 chmod -R 777 "/opt/cathook/data"
diff --git a/preload b/preload
index 4b4fccd3..31a4d78f 100755
--- a/preload
+++ b/preload
@@ -4,7 +4,7 @@ if [ $EUID == 0 ]; then
     echo "This script must not be run as root"
     exit
 fi
-line=$(pgrep -u $(logname) hl2_linux)
+line=$(pgrep -u $LOGNAME hl2_linux)
 arr=($line)
 
 if [ ${#arr[@]} != 0 ]; then
@@ -12,7 +12,7 @@ if [ ${#arr[@]} != 0 ]; then
     exit
 fi
 
-line=$(pgrep -u $(logname) steam)
+line=$(pgrep -u $LOGNAME steam)
 arr=($line)
 
 if [ ${#arr[@]} == 0 ]; then