add piler user param and err check

.vscode/numbered-bookmarks.json

@@ -4,8 +4,8 @@
 			"fsPath": "$ROOTPATH$/pilerbackup.sh",
 			"bookmarks": [
 				-1,
-				201,
-				-1,
+				301,
+				46,
 				-1,
 				-1,
 				-1,

pilerbackup.sh

@@ -43,7 +43,11 @@ badParam () {
     elif [ "$1" = "svc" ]; then
         printf "${err}\nError: '%s %s': Service does not exist!${norm}\n\n" \
             "$2" "$3"
-        exit 1    
+        exit 1
+    elif [ "$1" = "user" ]; then
+        printf "${err}\nError: '%s %s': User does not exist!${norm}\n\n" \
+            "$2" "$3"
+        exit 1
     fi
 }
 
@@ -203,6 +207,7 @@ webroot="/usr/share/nginx/html"
 exportAll=0
 exportStart=$( date -d 'yesterday' +'%Y.%m.%d' )
 exportEnd=$( date -d 'yesterday' +'%Y.%m.%d' )
+pilerUser='piler'
 
 
 ### process startup parameters
@@ -293,6 +298,19 @@ while [ $# -gt 0 ]; do
                 badParam empty "$@"
             fi
             ;;
+        --user)
+            # specify piler user account name
+            if [ -n "$2" ]; then
+                if id ${pilerUser} > /dev/null 2>&1; then
+                    pilerUser="$2"
+                    shift
+                else
+                    badParam user "$@"
+                fi
+            else
+                badParam empty "$@"
+            fi
+            ;;
         *)
             printf "${err}\nUnknown option: %s\n" "$1"
             printf "${cyan}Use '--help' for valid options.{$norm}\n\n"