codemod --extensions sh '#!/bin/bash' '#!/usr/bin/env bash'

net/gce.sh

@@ -1,4 +1,4 @@
-#!/bin/bash -e
+#!/usr/bin/env bash -e
 
 here=$(dirname "$0")
 # shellcheck source=net/common.sh
@@ -380,7 +380,7 @@ EOF
 
   declare startupScript="$netConfigDir"/instance-startup-script.sh
   cat > "$startupScript" <<EOF
-#!/bin/bash -ex
+#!/usr/bin/env bash -ex
 # autogenerated at $(date)
 
 cat > /etc/motd <<EOM