diff --git a/build-all b/build-all
index 32eed61..9070807 100755
--- a/build-all
+++ b/build-all
@@ -1,47 +1,33 @@
 #!/usr/bin/env sh
 
-yes_retrieve() \
+yes_retrieve()
 { : \
- && local image="$1" \
- && local ok=1 \
- && local out= \
+ && local image="$1" ok=1 out= g= \
  && shift \
  && [ -d out ] \
  && out="$(realpath out)" \
  && for f in "$@" \
     ;do : \
-     && local g="out/${f##*/}" \
-     &&  if [ -e "$g" ] \
-        ;then : \
-         && mv "$g" "$g~" \
-        ;fi \
+     && g="out/${f##*/}" \
+     && { ! [ -e "$g" ] || mv "$g" "$g~" ;} \
     ;done \
  && podman run -v="$out":/out --rm --entrypoint /bin/busybox "$image" \
     cp -- "$@" "/out/" \
  && for f in "$@" \
     ;do : \
-     && local g="out/${f##*/}" \
+     && g="out/${f##*/}" \
      &&  if [ -e "$g" ] \
         ;then : \
-         &&  if [ -e "$g~" ] \
-            ;then : \
-             && rm "$g~" \
-            ;fi \
+         && { ! [ -e "$g~" ] || rm "$g~" ;} \
         ;else : \
          && printf '%s: %s\n' yes_retrieve "failed to copy file $f to $g" \
          && ok=0 \
         ;fi \
     ;done \
  && [ $ok = 1 ] \
- ;} \
-;
+ ;}
 
-dbg_retrieve() \
-{ : \
- && yes_retrieve "$1" "$2" \
- && yes_retrieve "$1" "$2.dbg" \
- ;} \
-;
+dbg_retrieve() { yes_retrieve "$1" "$2" && yes_retrieve "$1" "$2.dbg" ;}
 
 : \
  && me="$(readlink -f "$0")" \