diff --git a/home/bashrc b/home/bashrc
index 62591d6..59c526a 100644
--- a/home/bashrc
+++ b/home/bashrc
@@ -38,21 +38,18 @@ _temporary_scope_() {
 
 . ~/.shrc
 
-ADDPATH "$HOME/sh" # this doesn't work for all scripts at the moment
+#ADDPATH "$HOME/sh" # this doesn't work for all scripts at the moment
+dummy() { :; } ### @- return 0, ignoring arguments.
 
 # combine everything matching "YES_BASH" in ~/sh/ into ~/.sh-bash.
 # unlike zsh, we do not check the sha1sum of the output.
- (: \
- && cd ~/sh \
- && printf '%s\n' '#!/usr/bin/env false' '[ -n "$preload" ] || exit 1' '' \
-  | cat - > ~/.sh-bash \
-    $(grep -lF YES_BASH -- $(find ~/sh/ -maxdepth 1 -type f '!' -name '*.bak')) \
- ;)
-
-dummy() { :; } ### @- return 0, ignoring arguments.
-preload=dummy
-. ~/.sh-bash
-unset preload
+if [ -s ~/sh/recombine ] && (. ~/sh/recombine) > ~/.sh-bash; then
+    preload=dummy
+    . ~/.sh-bash
+    unset preload
+elif [ -f ~/.sh-bash ]; then
+    rm ~/.sh-bash
+fi
 
 alias reload='cd; exec bash' ### @- **TODO:** respect initctl like in `.zshrc`.
 [ ! -e ~/.lol ] || . ~/.lol
diff --git a/sh/recombine b/sh/recombine
new file mode 100644
index 0000000..007b703
--- /dev/null
+++ b/sh/recombine
@@ -0,0 +1,35 @@
+#!/usr/bin/env false
+# FAKE_COMPAT
+
+cd ~/sh && unset IFS || exit
+case "$0" in
+(ash) SH=ASH;;
+(bash) SH=BASH;;
+(dash) SH=DASH;;
+(hush) SH=HUSH;;
+(ksh) SH=KSH;;
+(loksh) SH=LOKSH;;
+(mksh) SH=MKSH;;
+(oksh) SH=OKSH;;
+(osh) SH=OSH;;
+(posh) SH=POSH;;
+(yash) SH=YASH;;
+(zsh) SH=ZSH;;
+(*)
+    printf >&2 %s\\n "unknown shell (\$0): $0"
+    return 1
+esac
+
+printf %s\\n '#!/usr/bin/env false' '[ -n "$preload" ] || exit 1' ''
+for f in ~/sh/*; do
+    [ -n "${f##*.*}" ] && [ -f "$f" ] || continue
+    i=10 sh=
+    while IFS= read -r line; do
+        for word in $line; do
+            case "$word" in (YES_$SH) sh=1;; (NO_$SH) sh=0;; esac
+        done
+        [ "$((i-=1))" != 0 ] || break # act like head -n10
+    done < "$f"
+    [ "$sh" != 1 ] || set -- "$@" "$f"
+done
+[ $# = 0 ] || cat "$@"