diff --git a/usr/bin/aaa b/usr/bin/aaa
new file mode 100755
index 0000000..c5db6d6
--- /dev/null
+++ b/usr/bin/aaa
@@ -0,0 +1,25 @@
+#!/usr/bin/bash
+
+if [ "$#" -lt 1 ] || [ "$#" -gt 3 ]; then
+    echo "Usage: $0 arg1 [arg2] [arg3]"
+    exit 1
+fi
+
+# interactive session check
+if [ -t 0 ]; then
+    echo -n "Delete existing output files? [y/N]: "
+    read ans
+    case "$ans" in
+        y|Y) rm -f *.school ;;
+        *) echo "Aborted"; exit 0 ;;
+    esac
+fi
+
+# process input file
+while IFS= read -r line; do
+    new_f="${line%.*}.school"
+    f > "$new_f"
+done < "$FILE"
+
+exit 0
+
diff --git a/usr/bin/stereogramer b/usr/bin/stereogramer
new file mode 100755
index 0000000..a137321
--- /dev/null
+++ b/usr/bin/stereogramer
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+import sys
+import numpy as np
+from PIL import Image
+
+def depth_map(w, h):
+    # simple demo: circular bump
+    y, x = np.ogrid[:h, :w]
+    cx, cy = w // 2, h // 2
+    r = min(w, h) // 3
+    d = ((x - cx)**2 + (y - cy)**2) <= r*r
+    return d.astype(np.float32)
+
+def stereogram(depth, pattern_w=64, max_shift=32):
+    h, w = depth.shape
+    img = np.random.randint(0, 256, (h, w), dtype=np.uint8)
+
+    for y in range(h):
+        for x in range(pattern_w, w):
+            z = depth[y, x]
+            shift = int(z * max_shift)
+            src = x - pattern_w + shift
+            if src >= 0:
+                img[y, x] = img[y, src]
+    return img
+
+def main(argc, argv):
+    w = int(argv[1]) if argc > 1 else 600
+    h = int(argv[2]) if argc > 2 else 400
+    out = argv[3] if argc > 3 else "stereogram.png"
+
+    d = depth_map(w, h)
+    s = stereogram(d)
+
+    Image.fromarray(s).save(out)
+    print(out)
+
+if __name__ == "__main__":
+    main(len(sys.argv), sys.argv)
diff --git a/usr/bin/unzip_bruteforce b/usr/bin/unzip_bruteforce
index 8e33f57..7fa3cfb 100755
--- a/usr/bin/unzip_bruteforce
+++ b/usr/bin/unzip_bruteforce
@@ -1,28 +1,20 @@
 #!/usr/bin/env bash
 
-set -euo pipefail
+set -uo pipefail  # drop -e
 
 LIST=${1:-list}
 FILE=${2:-}
 
-usage() {
-    echo "usage: $0 [wordlist] <zipfile>"
-    echo "default wordlist: ./list"
-    exit 1
-}
-
-[[ -z "$FILE" ]] && usage
-[[ ! -f "$LIST" ]] && { echo "missing wordlist: $LIST"; exit 1; }
-[[ ! -f "$FILE" ]] && { echo "missing zip: $FILE"; exit 1; }
+[[ -z "$FILE" ]] && { echo "usage: $0 [wordlist] <zipfile>"; exit 1; }
 
 i=0
 
 while IFS= read -r line; do
     ((i++))
-
     (( i % 1000 == 0 )) && echo "$i tried..."
 
-    if unzip -P "$line" -t "$FILE" >/dev/null 2>&1; then
+    unzip -P "$line" -t "$FILE" >/dev/null 2>&1
+    if [[ $? -eq 0 ]]; then
         echo "FOUND: $line"
         exit 0
     fi