diff --git a/lib/spack/spack/cmd/commands.py b/lib/spack/spack/cmd/commands.py
index f9979339ed..c6e775dd43 100644
--- a/lib/spack/spack/cmd/commands.py
+++ b/lib/spack/spack/cmd/commands.py
@@ -11,7 +11,6 @@
 from argparse import ArgumentParser, Namespace
 from typing import IO, Any, Callable, Dict, Iterable, List, Optional, Sequence, Set, Tuple, Union
 
-import llnl.util.filesystem as fs
 import llnl.util.tty as tty
 from llnl.util.argparsewriter import ArgparseRstWriter, ArgparseWriter, Command
 from llnl.util.tty.colify import colify
@@ -867,9 +866,6 @@ def _commands(parser: ArgumentParser, args: Namespace) -> None:
             prepend_header(args, f)
             formatter(args, f)
 
-        if args.update_completion:
-            fs.set_executable(args.update)
-
     else:
         prepend_header(args, sys.stdout)
         formatter(args, sys.stdout)
diff --git a/share/spack/setup-env.csh b/share/spack/setup-env.csh
old mode 100755
new mode 100644
diff --git a/share/spack/setup-env.fish b/share/spack/setup-env.fish
old mode 100755
new mode 100644
diff --git a/share/spack/setup-env.sh b/share/spack/setup-env.sh
old mode 100755
new mode 100644
diff --git a/share/spack/setup-tutorial-env.sh b/share/spack/setup-tutorial-env.sh
old mode 100755
new mode 100644
diff --git a/share/spack/spack-completion.bash b/share/spack/spack-completion.bash
old mode 100755
new mode 100644
diff --git a/share/spack/spack-completion.fish b/share/spack/spack-completion.fish
old mode 100755
new mode 100644