añado set -e para salir cuando invoco exit 1 y controlamos que el chsh no se realice sobre root

utils_wp.sh

@@ -1,11 +1,17 @@
 #!/bin/bash -x
 
+set -e
+
 usage()
 {
-    echo "Usage: $0 [-h ] [ -s website ] [ -l | -v | -u userid ]" >&2
-    exit 1
+    echo "Usage: $0 [-h ] [ -s domain ] [ -l | -v | -u userid ]" >&2
+    exit 0
 }
 
+if [ $# -lt 3 ]; then
+    echo "not enough arguments"
+    usage
+fi
 
 while getopts ":hs:lu:v" opt;
 do
@@ -13,10 +19,10 @@ do
         h)
             echo "Usage:"
             echo "    $0 -h                      Display this help message."
-            echo "    $0 -s <website>            The website is a mandatory argument."
-            echo "    $0 -s <website> -l                      List WordPress users."
-            echo "    $0 -s <website> -v                      Display the WordPress version"
-            echo "    $0 -s <website> -u <userid>             Generate and set a random password for this WordPress userid."
+            echo "    $0 -s <domain>            The website is a mandatory argument."
+            echo "    $0 -s <domain> -l                      List WordPress users."
+            echo "    $0 -s <domain> -v                      Display the WordPress version"
+            echo "    $0 -s <domain> -u <userid>             Generate and set a random password for this WordPress userid."
             exit 0
             ;;
         s)
@@ -51,7 +57,6 @@ fi
 
 # declaration section
 
-
 # functions section
 
 check_err()
@@ -65,6 +70,10 @@ check_err()
 
 function get_sysuser() {
     SYSUSER=`ls -l /var/www/ | awk '$9 ~ /^'${WEB}'$/ { print $11 }' | awk -F'/' '{ print $6 }'`
+    if [ -z ${SYSUSER} ]; then
+        echo "SYSUSER contains nothing!"
+        exit 1
+    fi
     echo ${SYSUSER}
 }