sorting group of lines

Posted by benjamin button on Stack Overflow See other posts from Stack Overflow or by benjamin button
Published on 2010-02-22T11:59:41Z Indexed on 2010/05/09 14:28 UTC
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I have a text file like below

iv_destination_code_10
TAP310_mapping_RATERUSG_iv_destination_code_10
RATERUSG.iv_destination_code_10 = WORK.maf_feature_info[53,6]
iv_destination_code_2
TAP310_mapping_RATERUSG_iv_destination_code_2
RATERUSG.iv_destination_code_2 = WORK.maf_feature_info[1,6]
iv_destination_code_3
TAP310_mapping_RATERUSG_iv_destination_code_3
RATERUSG.iv_destination_code_3 = WORK.maf_feature_info[7,6]
iv_destination_code_4
TAP310_mapping_RATERUSG_iv_destination_code_4
RATERUSG.iv_destination_code_4 = WORK.maf_feature_info[13,6]
iv_destination_code_5
TAP310_mapping_RATERUSG_iv_destination_code_5
RATERUSG.iv_destination_code_5 = WORK.maf_feature_info[19,6]
iv_destination_code_6
TAP310_mapping_RATERUSG_iv_destination_code_6
RATERUSG.iv_destination_code_6 = WORK.maf_feature_info[29,6]
iv_destination_code_7
TAP310_mapping_RATERUSG_iv_destination_code_7
RATERUSG.iv_destination_code_7 = WORK.maf_feature_info[35,6]
iv_destination_code_8
TAP310_mapping_RATERUSG_iv_destination_code_8
RATERUSG.iv_destination_code_8 = WORK.maf_feature_info[41,6]
iv_destination_code_9
TAP310_mapping_RATERUSG_iv_destination_code_9
RATERUSG.iv_destination_code_9 = WORK.maf_feature_info[47,6]

combination of three lines form a unit:

    iv_destination_code_9
    TAP310_mapping_RATERUSG_iv_destination_code_9
    RATERUSG.iv_destination_code_9 = WORK.maf_feature_info[47,6]

is one unit.

iv_destination_code_9

9 indicates the number by which i have to sort 10 9 8....

i need a shell script/awk which will sort the units in a descending order. how is it possible?

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