initial

jar.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p jdk17
+
+set -euo pipefail
+
+if [ $# -eq 0 ]; then
+  echo "Usage: ./jar.sh <jar-args...>"
+  echo "Examples:"
+  echo "  ./jar.sh tf some.jar                     # list contents"
+  echo "  ./jar.sh tf some.jar | grep ClassName    # find a class"
+  exit 1
+fi
+
+jar "$@"