UNIX for Dummies Questions & Answers

Hi,

I have to parse the dhcp.lease file and have to keep the most recent entry and remove the rest and also the number of lines between any two leases might not always be the same.

eg:


lease 5.5.5.252 {
starts Wed Jul 27 09:48:39 2011
ends Wed Jul 27 21:48:39 2011
tstp Wed Jul 27 21:48:39 2011
binding state active;
next binding state free;
hardware ethernet 00:25:90:0a:95:e1;
uid "\001\000%\220\012\225\341";
}
lease 5.5.5.253 {
starts Wed Jul 27 11:18:04 2011
ends Wed Jul 27 23:18:04 2011
binding state active;
next binding state free;
hardware ethernet 00:1b:54:c9:e9:fd;
uid "\001\000\033T\311\351\375";
}
lease 5.5.5.252 {
starts Wed Jul 27 11:23:32 2011
ends Wed Jul 27 23:23:32 2011
binding state active;
next binding state free;
hardware ethernet 00:25:90:0a:95:e1;
uid "\001\000%\220\012\225\341";
}
lease 5.5.5.253 {
starts Wed Jul 27 11:24:35 2011
ends Wed Jul 27 23:24:35 2011
tstp Wed Jul 27 23:18:04 2011
binding state active;
next binding state free;
hardware ethernet 00:1b:54:c9:e9:fd;
uid "\001\000\033T\311\351\375";
}
lease 5.5.5.253 {
starts Wed Jul 27 11:27:56 2011
ends Wed Jul 27 23:27:56 2011
binding state active;
next binding state free;
hardware ethernet 00:1b:54:c9:e9:fd;
uid "\001\000\033T\311\351\375";
}



should give

lease 5.5.5.252 {
starts Wed Jul 27 11:23:32 2011
ends Wed Jul 27 23:23:32 2011
binding state active;
next binding state free;
hardware ethernet 00:25:90:0a:95:e1;
uid "\001\000%\220\012\225\341";
}

lease 5.5.5.253 {
starts Wed Jul 27 11:27:56 2011
ends Wed Jul 27 23:27:56 2011
binding state active;
next binding state free;
hardware ethernet 00:1b:54:c9:e9:fd;
uid "\001\000\033T\311\351\375";
}

as the output. Please help

---------- Post updated at 08:05 AM ---------- Previous update was at 08:02 AM ----------

The most recent entry is always the last occurence. I tried an earlier post on this forum but was not able to change it to suite my requirements. Any help is sincerely appreciated

If you know that the most recent entry is always the last occurence then its easier...than if they were randomly distributed in the file.