[rrd-users] how to take data from a .log file to RRD database

[beginner]

     HELLO,
    I use  RRDtool for the first time, I create RRD database to supervise
traffic of successful requests of one server. The number of successful
requests are generated every 60 seconds, and stored in a file named
data.log, it looks like  :

    10/08/31-02:46:56    131
    10/08/31-02:46:56    138
    10/08/31-02:46:56    144
    10/08/31-02:47:56    119
    10/08/31-02:47:56    121
    10/08/31-02:47:56    122
    10/08/31-02:48:56    118
    10/08/31-02:48:56    119
    10/08/31-02:48:56    121
    10/08/31-02:49:56    130
    10/08/31-02:49:56    136
    10/08/31-02:49:56    140
    10/08/31-02:49:56    4
    10/08/31-02:50:56    117
    10/08/31-02:50:56    129
    10/08/31-02:50:56    135
    i want to take data for example each 5min, average it and store it in my
rrd database my script shell is:

    #!/bin/sh
    FICRRD=$(basename $0 .sh)  # i give my script the name 'essai.sh'
     # - Date initialization :
    DTDEB=$(date -d "20100831 02:46:56" +'%s')
     # - Creation of my database:
    echo "Creation of database ${FICRRD}"
    rrdtool create    ${FICRRD}.rrd \
        -b ${DTDEB} \
        -s 60   #update every 1 minute so i can collect all data.
            DS:${FICRRD}:GAUGE:120:0:U \
          RRA:AVERAGE:0.5:5:6
    # CDP=5 PDP(1 PDP  collected each 60s), we stored each 30 min.

    # -store data:
     while read line
    do
    val=$( cut -d"    " -f2 data.log)  # val contains  the number of
successful requests
    rrdtool update ${FICRRD} $DTDEB:$val
    done <data.log
------
when i run  my script shell using the command ./essai.sh i get this:
ERROR: you must define at least one Round Robin Archive
./essai.sh: 26: -b: not found
./essai.sh: 30: DS:essai:GAUGE:600:0:U: not found
./essai.sh: 31: RRA:AVERAGE:0.5:5:6: not found

what am I doing wrong ?
I'm using       Ubuntu  10.04, RRDtool 1.3.8
I hope anyone can help.

best regards,
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