flesh out some compatibility stuff i forgot

sh/aur

@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
 # http://aur.sh with massive feature creep
-# YES_ZSH
-
-# TODO: check compatibility with bash and dash.
+# NO_ZSH
+# YES_BASH
+# NO_DASH
+# NO_ASH
 
 aur() { ### @-
     ### download, edit, make, and install packages from the
@@ -136,4 +137,6 @@ aur() { ### @-
     [ "$fail" -eq 0 ] && return 0 || return 1
 }
 
+[ -n "${preload+-}" ] || . ~/sh/preload || exit 2
+eval ${preload:-preload} confirm
 [ -n "${preload+-}" ] || aur "$@"

sh/confirm

@@ -2,6 +2,7 @@
 # YES_ZSH
 # YES_BASH
 # NO_DASH
+# NO_ASH
 
 ### @ confirm
 ### display a simple yes-or-no prompt and return 0-or-1 respectively.

sh/countdiff

@@ -2,6 +2,9 @@
 # YES_ZSH
 # YES_BASH
 # YES_DASH
+# YES_ASH
+
+# works with busybox awk.
 
 countdiff() { ### @-
     ### count the number of lines changed between two files.

sh/ff

@@ -2,6 +2,7 @@
 # YES_ZSH
 # YES_BASH
 # YES_DASH
+# YES_ASH
 
 ff() { ### @-
     ### select a file from a given or current directory using

sh/wipe

@@ -4,6 +4,8 @@
 # YES_DASH
 # YES_ASH
 
+# works with busybox awk.
+
 wipe() { ### @-
     ### clear the screen and its scrollback, then print a high-contrast horizontal line.
     ### using this, you'll know with absolute certainty that you're looking at the top of your history,