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diff --git a/users/Profpatsch/my-prelude/RunCommand.hs b/users/Profpatsch/my-prelude/RunCommand.hs
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+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+
+module RunCommand where
+
+import Data.ByteString qualified as ByteString
+import Data.ByteString.Lazy qualified as Bytes.Lazy
+import Data.Char qualified as Char
+import Data.List qualified as List
+import Data.Text qualified as Text
+import MyPrelude
+import System.Exit qualified as Exit
+import System.IO (Handle)
+import System.Process.Typed qualified as Process
+import Prelude hiding (log)
+
+-- | Given a a command, the executable and arguments,
+-- spawn the tool as subprocess and collect its stdout (stderr will go to our stderr).
+
+-- Will strip the stdout of trailing newlines.
+--
+-- If the executable is not a path, it will be resolved via the @PATH@ environment variable.
+runCommand :: MonadIO m => FilePath -> [Text] -> m (Exit.ExitCode, ByteString)
+runCommand executable args = do
+  let bashArgs = prettyArgsForBash ((executable & stringToText) : args)
+  log [fmt|Running: $ {bashArgs}|]
+  Process.proc
+    executable
+    (args <&> textToString)
+    & Process.readProcessStdout
+    <&> second toStrictBytes
+    <&> second stripWhitespaceFromEnd
+
+-- | Given a a command, the executable and arguments,
+-- spawn the tool as subprocess and run it to conclusion.
+--
+-- If the executable is not a path, it will be resolved via the @PATH@ environment variable.
+runCommandNoStdout :: MonadIO m => FilePath -> [Text] -> m Exit.ExitCode
+runCommandNoStdout executable args = do
+  let bashArgs = prettyArgsForBash ((executable & stringToText) : args)
+  log [fmt|Running: $ {bashArgs}|]
+  Process.proc
+    executable
+    (args <&> textToString)
+    & Process.runProcess
+
+-- TODO: This is reversing the whole string *twice*. Can we strip from end without doing that?
+stripWhitespaceFromEnd :: ByteString -> ByteString
+stripWhitespaceFromEnd = ByteString.reverse . ByteString.dropWhile (\w -> w == charToWordUnsafe '\n') . ByteString.reverse
+
+-- | Like `runCommand`, but takes a Bytestring that provides the command with streamed input on stdin.
+runCommandWithStdin :: MonadIO m => FilePath -> [Text] -> Bytes.Lazy.ByteString -> m (Exit.ExitCode, ByteString)
+runCommandWithStdin executable args stdin = do
+  let bashArgs = prettyArgsForBash ((executable & stringToText) : args)
+  log [fmt|Running: $ {bashArgs}|]
+  Process.proc
+    executable
+    (args <&> textToString)
+    & Process.setStdin (Process.byteStringInput stdin)
+    & Process.readProcessStdout
+    <&> second toStrictBytes
+    <&> second stripWhitespaceFromEnd
+
+-- | Like `runCommand`, but takes a Bytestring that provides the command with streamed input on stdin.
+runCommandWithStdinNoStdout :: MonadIO m => FilePath -> [Text] -> Bytes.Lazy.ByteString -> m Exit.ExitCode
+runCommandWithStdinNoStdout executable args stdin = do
+  let bashArgs = prettyArgsForBash ((executable & stringToText) : args)
+  log [fmt|Running: $ {bashArgs}|]
+  Process.proc
+    executable
+    (args <&> textToString)
+    & Process.setStdin (Process.byteStringInput stdin)
+    & Process.runProcess
+
+-- | Like 'runCommandWithStdin' but exit if the command returns a non-0 status.
+runCommandWithStdinExpect0 :: MonadIO m => FilePath -> [Text] -> Bytes.Lazy.ByteString -> m ByteString
+runCommandWithStdinExpect0 executable args stdin =
+  runCommandWithStdin executable args stdin >>= \case
+    (ex, stdout) -> do
+      checkStatus0 executable ex
+      pure stdout
+
+-- | Like 'runCommandWithStdinNoStdout' but exit if the command returns a non-0 status.
+runCommandWithStdinNoStdoutExpect0 :: MonadIO m => FilePath -> [Text] -> Bytes.Lazy.ByteString -> m ()
+runCommandWithStdinNoStdoutExpect0 executable args stdin =
+  runCommandWithStdinNoStdout executable args stdin
+    >>= checkStatus0 executable
+
+-- | Like 'runCommandExpect0', but don’t capture stdout,
+-- connect stdin and stdout to the command until it returns.
+--
+-- This is for interactive subcommands.
+runCommandInteractiveExpect0 :: MonadIO m => FilePath -> [Text] -> m ()
+runCommandInteractiveExpect0 executable args = do
+  let bashArgs = prettyArgsForBash ((executable & stringToText) : args)
+  log [fmt|Running interactively: $ {bashArgs}|]
+  ( liftIO $
+      Process.runProcess $
+        Process.proc
+          executable
+          (args <&> textToString)
+    )
+    >>= checkStatus0 executable
+
+-- | Given a name of a command, the executable and arguments,
+-- spawn the tool as subprocess and pipe its stdout to the given 'Handle'.
+--
+-- If the executable is not a path, it will be resolved via the @PATH@ environment variable.
+runCommandPipeToHandle :: MonadIO m => FilePath -> [Text] -> Handle -> m Exit.ExitCode
+runCommandPipeToHandle executable args handle = do
+  -- TODO log the output file?
+  let bashArgs = prettyArgsForBash ((executable & stringToText) : args)
+  log [fmt|Running: $ {bashArgs}|]
+  liftIO $
+    Process.runProcess
+      ( Process.proc
+          executable
+          (args <&> textToString)
+          & Process.setStdout (Process.useHandleClose handle)
+      )
+
+-- | Check whether a command exited 0 or crash.
+checkStatus0 :: MonadIO m => FilePath -> Exit.ExitCode -> m ()
+checkStatus0 executable = \case
+  Exit.ExitSuccess -> pure ()
+  Exit.ExitFailure status -> do
+    logCritical [fmt|Command `{executable}` did not exit with status 0 (success), but status {status}|]
+
+log :: MonadIO m => Text -> m ()
+log = liftIO . putStderrLn
+
+-- | Log the message on the normal logging level & exit the program
+logCritical :: MonadIO m => Text -> m b
+logCritical msg = do
+  liftIO $ putStderrLn msg
+  liftIO $ Exit.exitWith (Exit.ExitFailure 1)
+
+-- | Pretty print a command line in a way that can be copied to bash.
+prettyArgsForBash :: [Text] -> Text
+prettyArgsForBash = Text.intercalate " " . map simpleBashEscape
+
+-- | Simple escaping for bash words. If they contain anything that’s not ascii chars
+-- and a bunch of often-used special characters, put the word in single quotes.
+simpleBashEscape :: Text -> Text
+simpleBashEscape t = do
+  case Text.find (not . isSimple) t of
+    Just _ -> escapeSingleQuote t
+    Nothing -> t
+  where
+    -- any word that is just ascii characters is simple (no spaces or control characters)
+    -- or contains a few often-used characters like - or .
+    isSimple c =
+      Char.isAsciiLower c
+        || Char.isAsciiUpper c
+        || Char.isDigit c
+        -- These are benign, bash will not interpret them as special characters.
+        || List.elem c ['-', '.', ':', '/']
+    -- Put the word in single quotes
+    -- If there is a single quote in the word,
+    -- close the single quoted word, add a single quote, open the word again
+    escapeSingleQuote t' = "'" <> Text.replace "'" "'\\''" t' <> "'"