app_29@android:/ $ export PATH=/data/local/bin:$PATH
app_29@android:/ $ su
app_29@android:/ # md temp
sh: md: not found
127|app_29@android:/ # cp
sh: cp: not found
127|app_29@android:/ #
Doesn't that indicate that it's not properly symlinked?
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EDIT: oops! Got DOS in my head. md isn't a command, but cp should be, no?
Try
busybox cp instead of cp
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