diff --git a/Fonderie/crapulator.c b/Fonderie/crapulator.c
index 0fd2eef..05f2767 100644
--- a/Fonderie/crapulator.c
+++ b/Fonderie/crapulator.c
@@ -218,6 +218,10 @@ switch (idFx) {
 		retval = random_blocks(image, 70);
 		break;
 
+	case CR_shiftln0:
+		retval = multilines_shift_0(image, 11, 120);
+		break;
+
 	case CR_message:
 		fprintf(stderr, "### message from pid %d, fv=%f ###\n",
 						getpid(), fval);
@@ -289,18 +293,15 @@ return "???";
 /* -------------------------------------------------------------- */
 int crap_number_from_name(char *name)
 {
-int		idx, foo, retval;
+int		idx, retval;
 
 #if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( '%s' )\n", __func__, name);
 #endif
 
 retval = -1;		/* not found */
-
 for (idx=0; CrapL[idx].id!=-1; idx++) {
-
-	foo = strcmp(CrapL[idx].name, name);
-	if (0 == foo) {
+	if (0 == strcmp(CrapL[idx].name, name)) {
 		// fprintf(stderr, "found '%s' -> %d\n", name, 
 		//				CrapL[idx].id);
 		retval = CrapL[idx].id;
diff --git a/Fonderie/crapulator.h b/Fonderie/crapulator.h
index a7aa2d2..f07e56e 100644
--- a/Fonderie/crapulator.h
+++ b/Fonderie/crapulator.h
@@ -2,18 +2,20 @@
  *		crapulator.h
  */
 
-/*
- *	some constants for effect numbers		*/
-
 /*
  *	the main function				*/
 
 int crapulator(FloatImg *image, int id_effect, float fparam);
 
+/*
+ *	naming system					*/
 void list_crapulors(char *texte);
-
 char	*crap_name_from_number(int num);
 int	 crap_number_from_name(char *name);
 
+/*
+ *	this generated file contains the #define
+ *	for symbolic name of effect ids.
+ */
 #include  "crapdef.h"
 
diff --git a/Fonderie/crapulors.liste b/Fonderie/crapulors.liste
index 5527bf7..5df72fe 100644
--- a/Fonderie/crapulors.liste
+++ b/Fonderie/crapulors.liste
@@ -22,5 +22,6 @@
 24	bsombra		1	1.0
 25	vsglitch	1	1.0
 26	rndblks		1	1.0
+27	shiftln0	1	1.0
 99	message		1	1.0
 -1	end		1	1.0
diff --git a/Fonderie/filterstack.c b/Fonderie/filterstack.c
index 69785b5..1ac2baf 100644
--- a/Fonderie/filterstack.c
+++ b/Fonderie/filterstack.c
@@ -208,6 +208,11 @@ for (;;) {
 		value = crap_number_from_name(cptr);
 		// fprintf(stderr, "%s: '%s' -> %d\n", __func__,
 		//			cptr, value);
+		if (value < 0) {
+			fprintf(stderr, "%s: '%s' not found\n",
+				__func__, cptr);
+			return -1;
+			}
 		foo = filterstack_add(numid, value, 1, 1.0);
 		continue;
 		}
diff --git a/Fonderie/glitches.c b/Fonderie/glitches.c
index 3df039f..6ed509b 100644
--- a/Fonderie/glitches.c
+++ b/Fonderie/glitches.c
@@ -7,6 +7,7 @@
 
 #include  <stdio.h>
 #include  <stdlib.h>
+#include  <string.h>
 #include  <math.h>
 
 #include  "../floatimg.h"
@@ -188,4 +189,48 @@ for (y=BB; y<h-BB; y++) {
 return 0;
 }
 /*   --------------------------------------------------------------   */
+static void shifter(float *fs, float *fd, int w, int nbr)
+{
+int	krkr;
+
+for (krkr=0; krkr<nbr; krkr++) {
+	fd[krkr] = fs[(krkr+w)%nbr];
+	}
+/* take your sixpack, film at 11 */
+}
+
+int multilines_shift_0(FloatImg *picz, int step, int nombre)
+{
+float		*buffline, *sptr;
+int		idx, ypos;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %d %d )\n", __func__, picz, step, nombre);
+#endif
+
+buffline = alloca(picz->width * sizeof(float));
+if (NULL==buffline) {
+	fprintf(stderr, "%s: memory panic\n", __func__);
+	abort();
+	}
+
+for (idx=0; idx<nombre; idx++) {
+	ypos = rand() % picz->height;
+
+	sptr = picz->R + (ypos * picz->width);
+	shifter(sptr, buffline, step, picz->width);
+	memcpy(sptr, buffline, picz->width*sizeof(float));
+
+	sptr = picz->G + (ypos * picz->width);
+	shifter(sptr, buffline, step, picz->width);
+	memcpy(sptr, buffline, picz->width*sizeof(float));
+
+	sptr = picz->B + (ypos * picz->width);
+	shifter(sptr, buffline, step, picz->width);
+	memcpy(sptr, buffline, picz->width*sizeof(float));
+	}
+
+return 0;
+}
+/*   --------------------------------------------------------------   */
 
diff --git a/Fonderie/glitches.h b/Fonderie/glitches.h
index 845de14..965a5d9 100644
--- a/Fonderie/glitches.h
+++ b/Fonderie/glitches.h
@@ -12,5 +12,6 @@ int poke_a_random_pixel(FloatImg *picz, float fval, int kaboo);
 
 int vertical_singlitch(FloatImg *picz, int xpos, float fv, float omega,
 							float phi);
+int multilines_shift_0(FloatImg *picz, int step, int nombre);
 
 /* this is a wtf file */
diff --git a/Fonderie/interpolator.c b/Fonderie/interpolator.c
index ede2277..838d842 100644
--- a/Fonderie/interpolator.c
+++ b/Fonderie/interpolator.c
@@ -229,9 +229,6 @@ for (idx=0; idx<globbuf.gl_pathc; idx++) {
 	/* XXX THIS CODE DON'T WORK !!! */
 #endif
 
-
-
-
 	}
 
 fprintf(stderr, "\ngenerated %d png files\n", ipng);
@@ -273,11 +270,11 @@ fprintf(stderr, "*** %s : compiled by tTh, %s %s\n", __FILE__,
 			__DATE__, __TIME__);
 fimg_print_version(2);
 
-//#if DEBUG_LEVEL
+#if DEBUG_LEVEL
 /* this is for the debug off calling shellscript */
 for (foo=0; foo<argc; foo++)
 	fprintf(stderr, "%5d     %s\n", foo, argv[foo]);
-//#endif
+#endif
 
 while ((opt = getopt(argc, argv, "E:F:hLS:vw:x:")) != -1) {
 	switch(opt) {
diff --git a/Fonderie/t.c b/Fonderie/t.c
index 740223a..b0049bb 100644
--- a/Fonderie/t.c
+++ b/Fonderie/t.c
@@ -69,6 +69,9 @@ return 0;
 int help(void)
 {
 puts("yolo!");
+
+puts("\t-L\tlist available filters");
+
 exit(0);
 }
 /* ----------------------------------------------------------- */
@@ -103,11 +106,14 @@ fprintf(stderr, "*** %s : compiled by tTh, %s %s\n", __FILE__,
 			__DATE__, __TIME__);
 fimg_print_version(2);
 
-while ((opt = getopt(argc, argv, "hF:i:o:vx")) != -1) {
+while ((opt = getopt(argc, argv, "hF:i:Lo:vx")) != -1) {
 	switch(opt) {
 		case 'h':	help();			break;
 		case 'F':	filterchain = optarg;	break;
 		case 'i':	infile = optarg;	break;
+		case 'L':
+			list_crapulors("available filters");
+			exit(0);
 		case 'o':	outfile = optarg;	break;
 		case 'v':	verbosity++;		break;
 		case 'x':	experiment();		break;