slackware-current/source/l/netpbm/netpbm-ppmfadeusage.patch

--- ./editor/ppmfade.orig	2023-10-02 13:25:51.308938861 -0500
+++ ./editor/ppmfade	2023-10-02 13:28:24.940930364 -0500
@@ -109,13 +109,13 @@
                 print STDERR ("There are no non-option arguments possible.  " .
                               "You specified '$arg'\n");
             }
-            exit 100;
+            exit 1;
         }
     }
 
     if (!defined($firstFileNm) && !defined($lastFileNm)) {
         print STDERR ("You must specify -f or -l (or both)\n");
-        exit 90;
+        exit 1;
     }
 
     if (!defined($mode)) {
@@ -142,7 +142,7 @@
         } else {
             print STDERR
                 ("Unrecognized results from pnmfile on $firstFileNm.\n");
-            exit(50);
+            exit 1;
         }
     } else {
         # $lastFileNm is defined
@@ -151,7 +151,7 @@
         } else {
             print STDERR
                 ("Unrecognized results from pnmfile on $firstFileNm.\n");
-            exit(50);
+            exit 1;
         }
     }
     return $width, $height;
@@ -436,12 +436,12 @@
 
 if (defined($firstFileNm) && !-e($firstFileNm)) {
     print STDERR ("First file '$firstFileNm' does not exist\n");
-    exit 20;
+    exit 1;
 }
 
 if (defined($lastFileNm) && !-e($lastFileNm)) {
     print STDERR ("Last file '$lastFileNm' does not exist\n");
-    exit 20;
+    exit 1;
 }
 
 my ($width, $height) = imageDimensions($firstFileNm, $lastFileNm);