Thanks Klaus, 
 
After change the LAST_LINE in the kamctlrc, the tail error is going, but it still says user "xxxx" already exists.

# tail tool
LAST_LINE="tail -1"
 
I find the script below returns "false"  which makes the kamctl exit.
 
# params: user
# output: false if exists, true otherwise
is_user() {
        set_user $1
        QUERY="select count(*) from $SUB_TABLE where \
        $SUBSCRIBER_COLUMN='$OSERUSER' and $REALM_COLUMN='$OSERDOMAIN';"
        CNT=`$DBROCMD "$QUERY" "$DBRAWPARAMS" | $EGREP -v ERROR | $LAST_LINE`
        mdbg "is_user: user counter=$CNT"
        if [ "$CNT" = "0" ] ; then
                false
        else
                true
        fi
}

 
What could be the cause?
 
Thanks,
Kevin

 
> Date: Thu, 10 Jun 2010 10:11:18 +0200
> From: klaus.mailinglists@pernau.at
> To: kevin.jzh@hotmail.com
> CC: sr-users@lists.sip-router.org
> Subject: Re: [SR-Users] Fail to add user account
>
>
>
> Am 10.06.2010 03:12, schrieb JinKevin:
> > AppSer01:root@/usr/local/kamailio-3.0/sbin$ kamctl add 2000 2000
> > usage: tail [+/-[n][lbc][f]] [file]
> > tail [+/-[n][l][r|f]] [file]
> > INFO: user '2000' already exists
>
>
> between your kamctl command and the error message (user '2000' already
> exists) is an error produced by the tail command.
>
> Looks like kamctl uses tail in a way which is not supported on your OS.
>
> regards
> klaus

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