diff --git a/optipdf b/optipdf
index 859bbda..aa48c72 100755
--- a/optipdf
+++ b/optipdf
@@ -12,6 +12,46 @@ cleanup() {
 }
 trap 'cleanup' EXIT
 
+FILES=()
+NO_MORE_FLAGS=0
+for ARG; do
+    # Assume arguments that don't begin with a - are supposed to be files or other operands
+    if [[ $NO_MORE_FLAGS -eq 0 && $ARG = -* ]]; then
+        case "$ARG" in
+            --backup=*)
+                KEEP_BACKUP_SUFFIX=${ARG#*=}
+                ;;
+            --no-backup)
+                KEEP_BACKUP_SUFFIX=
+                ;;
+            --force|-f)
+                FORCE=1
+                ;;
+            --no-force|--careful)
+                FORCE=0
+                ;;
+            --lossy)
+                LOSSY=1
+                ;;
+            --no-lossy)
+                LOSSY=0
+                ;;
+            --)
+                NO_MORE_FLAGS=1
+                ;;
+            *)
+                printf 'Unrecognized flag: %s\n' \
+                    "$ARG" \
+                    >&2
+                USAGE >&2
+                exit 2
+                ;;
+        esac
+    else
+        FILES+=("$ARG")
+    fi
+done
+
 file_size() {
     stat \
         --format='%s' \
@@ -149,7 +189,7 @@ fi
 
 ERRORS=0
 FREED_TOTAL=0
-for FILE; do
+for FILE in "${FILES[@]}"; do
     rm -f -- "$TEMP"
     BEGIN_FILESIZE=$(file_size "$FILE")