Running the latest version of ldapscripts from Debian lenny (ver 1.7.1-2) I was getting this error:

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trap: usage: trap [-lp] [arg signal_spec ...]

whenever I was running ldapadduser.

To fix this you have to edit /usr/share/ldapscripts/runtime and find the line:

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...
# Reset traps
**trap -**
...

and change it to:

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trap - 2

in order to fix the trap error.