diff --git a/README.md b/README.md
index c9009a45..ef4807e0 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ $ bb '(vec (dedupe *in*))' <<< '[1 1 1 1 2]'
 ## Rationale
 
 If you're a bash expert, you probably don't need this. But for those of us who
-can use a bit of Clojure in their shell scripts, it may be useful.
+scan use a bit of Clojure in their shell scripts, it may be useful.
 
 Properties:
 
@@ -66,7 +66,7 @@ You may also download a binary from [Github](https://github.com/borkdude/babashk
 ## Usage
 
 ``` shellsession
-... | bb [-i] [-o] '<Clojure form>'
+bb [ --help ] [ -i ] [ -o ] [ -io ] [ --version ] [ expression ]
 ```
 
 There is one special variable, `*in*`, which is the input read from stdin. The
@@ -77,8 +77,14 @@ shell-scripting friendly output. To combine `-i` and `-o` you can use `-io`.
 
 The current version can be printed with `bb --version`.
 
-Currently only the macros `if`, `when`, `and`, `or`, `->`, `->>` and `as->` are
-supported.
+Currently only the following special forms/macros are supported: anonymous
+function literals like `#(%1 %2)`, `quote`, `do`,`if`, `when`, `let`, `and`,
+`or`, `->`, `->>`, `as->`.
+
+The `clojure.core` functions are accessible without a namespace alias. Those in
+`clojure.string` are accessed through the alias `str`, like:
+`str/includes?`. Those in `clojure.set` using the alias `set`, like:
+`set/difference`.
 
 Examples:
 
@@ -109,6 +115,15 @@ $ ls | bb -i '(filterv #(re-find #"reflection" %) *in*)'
 ["reflection.json"]
 ```
 
+Shell commands can be executed using `csh` which is an alias for
+`clojure.java.shell/sh`:
+
+``` shellsession
+$ bb '(run! #(csh "touch" (str "/tmp/test/" %)) (range 100))'
+$ ls /tmp/test | bb -i '*in*'
+["0" "1" "10" "11" "12" "13" "14" "15" "16" "17" "18" "19" "2" "20" "21" ...]
+```
+
 More examples can be found in the [gallery](#gallery).
 
 ## Test
diff --git a/project.clj b/project.clj
index e27c9736..9c32dd35 100644
--- a/project.clj
+++ b/project.clj
@@ -9,7 +9,7 @@
             :url "http://opensource.org/licenses/eclipse-1.0.php"}
   :source-paths ["src"]
   :dependencies [[org.clojure/clojure "1.9.0"]
-                 [borkdude/sci "0.0.2"]]
+                 [borkdude/sci "0.0.4"]]
   :profiles {:clojure-1.9.0 {:dependencies [[org.clojure/clojure "1.9.0"]]}
              :clojure-1.10.1 {:dependencies [[org.clojure/clojure "1.10.1"]]}
              :test {:dependencies [[clj-commons/conch "0.9.2"]]}
diff --git a/reflection.json b/reflection.json
index 81942d35..c829f5fa 100644
--- a/reflection.json
+++ b/reflection.json
@@ -1,9 +1,33 @@
 [
-    {
-        "name": "java.lang.Class",
-        "allDeclaredConstructors": true,
-        "allPublicConstructors": true,
-        "allDeclaredMethods": true,
-        "allPublicMethods": true
-    }
+  {
+    "name": "java.lang.Class",
+    "allDeclaredConstructors": true,
+    "allPublicConstructors": true,
+    "allDeclaredMethods": true,
+    "allPublicMethods": true
+  },
+  {
+    "name":"java.io.BufferedReader",
+    "allPublicMethods":true
+  },
+  {
+    "name":"java.lang.Process",
+    "allPublicMethods":true
+  },
+  {
+    "name":"java.lang.ProcessBuilder",
+    "allPublicConstructors":true
+  },
+  {
+    "name":"java.lang.String",
+    "allPublicMethods":true
+  },
+  {
+    "name":"java.lang.UNIXProcess",
+    "allPublicMethods":true
+  },
+  {
+    "name":"java.util.concurrent.LinkedBlockingQueue",
+    "allPublicMethods":true
+  }
 ]
diff --git a/resources/BABASHKA_VERSION b/resources/BABASHKA_VERSION
index af1ac3d8..5a5831ab 100644
--- a/resources/BABASHKA_VERSION
+++ b/resources/BABASHKA_VERSION
@@ -1 +1 @@
-0.0.7-SNAPSHOT
+0.0.7
diff --git a/script/compile b/script/compile
index 80ada177..a2ad0ea0 100755
--- a/script/compile
+++ b/script/compile
@@ -17,8 +17,10 @@ $GRAALVM_HOME/bin/native-image \
   -J-Dclojure.spec.skip-macros=true \
   -J-Dclojure.compiler.direct-linking=true \
   "-H:IncludeResources=BABASHKA_VERSION" \
+  "-H:IncludeResources=SCI_VERSION" \
   -H:ReflectionConfigurationFiles=reflection.json \
-  --initialize-at-build-time  \
+  --initialize-at-run-time=java.lang.Math\$RandomNumberGeneratorHolder \
+  --initialize-at-build-time \
   -H:Log=registerResource: \
   --verbose \
   --no-fallback \
diff --git a/script/test b/script/test
index 54364d3c..eeef9e2d 100755
--- a/script/test
+++ b/script/test
@@ -2,7 +2,7 @@
 
 set -eo pipefail
 
-if [ "$JET_TEST_ENV" = "native" ]; then
+if [ "$BABASHKA_TEST_ENV" = "native" ]; then
     lein test
 else
     echo "Testing with Clojure 1.9.0"
diff --git a/src/babashka/main.clj b/src/babashka/main.clj
index 21a660df..6282b3f7 100644
--- a/src/babashka/main.clj
+++ b/src/babashka/main.clj
@@ -3,11 +3,15 @@
   (:require
    [clojure.edn :as edn]
    [clojure.java.io :as io]
+   [clojure.java.shell :as cjs]
    [clojure.string :as str :refer [starts-with?]]
    [sci.core :as sci])
   (:gen-class))
 
 (set! *warn-on-reflection* true)
+;; To detect problems when generating the image, run:
+;; echo '1' | java -agentlib:native-image-agent=config-output-dir=/tmp -jar target/babashka-xxx-standalone.jar '...'
+;; with the java provided by GraalVM.
 
 (defn read-edn [s]
   (edn/read-string
@@ -33,35 +37,83 @@
                             (get opts "-io")))
         raw-out (boolean (or (get opts "-o")
                              (get opts "-io")))
-        println? (boolean (get opts "--println"))]
+        println? (boolean (get opts "--println"))
+        help? (boolean (get opts "--help"))]
     {:version version
      :raw-in raw-in
      :raw-out raw-out
-     :println? println?}))
+     :println? println?
+     :help? help?}))
+
+(defn parse-shell-string [s]
+  (str/split s #"\n"))
+
+(defn print-version []
+  (println (str "babashka v"(str/trim (slurp (io/resource "BABASHKA_VERSION"))))))
+
+(def usage-string "Usage: [ --help ] [ -i ] [ -o ] [ -io ] [ --version ] [ expression ]")
+(defn print-usage []
+  (println usage-string))
+
+(defn print-help []
+  (println (str "babashka v" (str/trim (slurp (io/resource "BABASHKA_VERSION")))))
+  (println (str "sci v" (str/trim (slurp (io/resource "SCI_VERSION")))))
+  (println)
+  (print-usage)
+  (println)
+  (println "Options:")
+  (println "
+  --help: print this help text.
+  --version: print the current version of babashka.
+
+  -i: read shell input into a list of strings instead of reading EDN.
+  -o: write shell output instead of EDN.
+  -io: combination of -i and -o.
+"))
+
+(defn main
+  [& args]
+  (or
+   (let [{:keys [:version :raw-in :raw-out :println?
+                 :help?]} (parse-opts args)]
+     (second
+      (cond version
+            [(print-version) 0]
+            help?
+            [(print-help) 0]
+            :else
+            (try
+              [(let [exprs (drop-while #(str/starts-with? % "-") args)
+                     _ (when (not= (count exprs) 1)
+                         (throw (Exception. ^String usage-string)))
+                     expr (last args)
+                     in (delay (let [in (slurp *in*)]
+                                 (if raw-in
+                                   (parse-shell-string in)
+                                   (read-edn in))))
+                     res (sci/eval-string
+                          expr
+                          {:bindings {(with-meta '*in*
+                                        {:sci/deref! true}) in
+                                      'run! run!
+                                      'csh cjs/sh}})]
+                 (if raw-out
+                   (if (coll? res)
+                     (doseq [l res]
+                       (println l))
+                     (println res))
+                   ((if println? println? prn) res))) 0]
+              (catch Exception e
+                (binding [*out* *err*]
+                  (println (str/trim
+                            (or (:stderr (ex-data e))
+                                (.getMessage e))) ))
+                [nil 1])))))
+   1))
 
 (defn -main
   [& args]
-  (let [{:keys [:version :raw-in :raw-out :println?]} (parse-opts args)]
-    (cond version
-      (println (str/trim (slurp (io/resource "BABASHKA_VERSION"))))
-      :else
-      (let [expr (last args)
-            in (slurp *in*)
-            in (if raw-in
-                 (str/split in #"\n")
-                 (read-edn in))
-            ;; _ (prn in)
-            res (try (sci/eval-string expr {:bindings {'*in* in}})
-                     (catch Exception e
-                       (binding [*out* *err*]
-                         (println (.getMessage e)))
-                       (System/exit 1)))]
-        (if raw-out
-          (if (coll? res)
-            (doseq [l res]
-              (println l))
-            (println res))
-          ((if println? println? prn) res))))))
+  (System/exit (apply main args)))
 
 ;;;; Scratch
 
diff --git a/test/babashka/main_test.clj b/test/babashka/main_test.clj
index d0995f3c..255db482 100644
--- a/test/babashka/main_test.clj
+++ b/test/babashka/main_test.clj
@@ -2,6 +2,7 @@
   (:require
    [clojure.test :as test :refer [deftest is testing]]
    [babashka.test-utils :as test-utils]
+   [babashka.main :as main]
    [clojure.edn :as edn]
    [clojure.string :as str]))
 
@@ -50,7 +51,7 @@
                              "-io"
                              (str '(shuffle *in*)))
           out-lines (set (str/split out #"\n"))]
-      (= in-lines out-lines)))
+      (is (= in-lines out-lines))))
   (testing "find occurrences in file by line number"
     (is (= '(1 3)
            (->
@@ -58,3 +59,7 @@
                 "-i"
                 "(map-indexed #(-> [%1 %2]) *in*)")
             (bb "(keep #(when (re-find #\"(?i)clojure\" (second %)) (first %)) *in*)"))))))
+
+(deftest input-test
+  (testing "bb doesn't wait for input if *in* isn't used"
+    (is (= "2\n" (with-out-str (main/main "(inc 1)"))))))
diff --git a/test/babashka/test_utils.clj b/test/babashka/test_utils.clj
index 352edfa6..bd3703e9 100644
--- a/test/babashka/test_utils.clj
+++ b/test/babashka/test_utils.clj
@@ -8,7 +8,7 @@
 (defn bb-jvm [input & args]
   (with-out-str
     (with-in-str input
-      (apply main/-main args))))
+      (apply main/main args))))
 
 (defn bb-native [input & args]
   (let-programs [bb "./bb"]