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diff --git a/util/README.markdown b/util/README.markdown
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+# various utils
+
+## //util/bin/with
+
+  execute a command with an extended/modified environment
+
+### usage
+
+    with ENV COMMAND
+
+  where `ENV` is the name of the environment and
+  `COMMAND` your to-be-executed command (-line).
+
+### environment
+
+  - `env_dir` defines the directory where environment files are searched.
+    Default: `$HOME/.env.d`.
+
+### example
+
+    cat > ~/.with/frh-ire <<EOF
+    export api_url=...
+    export api_key=...
+    export api_hash=...
+    EOF
+
+    with frh-ire //ext/solus/bin/client info
diff --git a/util/bin/with b/util/bin/with
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+#! /bin/sh
+set -euf
+ENV="${env_dir-$HOME/.env.d}/$1"
+shift
+. "$ENV"
+exec "$@"