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Full Discussion: sed/awk: Delete matching words leaving only the first instance
Top Forums Shell Programming and Scripting sed/awk: Delete matching words leaving only the first instance Post 302388164 by GrinningArmor on Tuesday 19th of January 2010 03:14:40 PM
Old 01-19-2010
Question sed/awk: Delete matching words leaving only the first instance
I have an input text that looks like this (comes already sorted):
Code:
on Caturday 22 at 10:15, some event
on Caturday 22 at 10:15, some other event
on Caturday 22 at 21:30, even more events
on Funday 23 at 11:00, yet another event

I need to delete all the matching words between the lines, from the start of each line, leaving only the first instance of each date.
To clarify, i need to turn it into something like this:
Code:
on Caturday 22 at 10:15, some event
                         some other event
               at 21:30, even more events
on Funday 23 at 11:00, yet another event

So then I could format it like this to make it shorter, which is what I'm after:
Code:
on Caturday 22 at 10:15, some event; some other event; at 21:30, even more events
on Funday 23 at 11:00, yet another event

Is there a way to do something like this with sed and awk?
 

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LEARN ABOUT HPUX

event_class

event_class(5)															    event_class(5)

NAME

       event class file - The file that contains the declaration of an event class.

DESCRIPTION

       Audit events can be logically grouped into event classes.  Event classes are defined in event class files.  An event class file contains an
       event class number and a list of event numbers corresponding to audit events.

       All event class files must be created in the dcelocal/etc/audit/ec directory.

       The name of the event class file becomes the name of the event class.  The recommended naming convention for event class files is:

       dce_server-name_class

       where class is a descriptive text that characterizes the event class.

       Event class files must be write-protected by the local operating system (that is, only administrators should have  write  access  to  these
       files).	Audit clients read these files to maintain an event table in their address space.

       Optionally,  an	event class file can contain a SEP line.  This line contains a list of prefixes of the event numbers in the file.  The SEP
       line speeds up the scanning performed by the Audit clients.  Audit clients which do not have events with one of the  prefixes  listed  will
       not  scan  the event list.  If the SEP line is not provided in the file, Audit clients will have to read the entire file to find out if the
       event class file contains any of their events.

       Empty lines are ignored in the event class file.

       Comments are designated by the number sign (#) placed before the comment text.

   The Event Class File Format
       The format of an event class file is: ECN=event_class_number SEP=prefix_1 prefix_2 ...  # comments start with the  number  sign	event_num-
       ber_1 event_number_2

EXAMPLES

       Following  is  an  example  of  an  event class file for the event class ec_local_authentication: ECN = 0x00000001 SEP = 0x100 # AS_Request
       0x00000100 # TGS_TicketReq 0x00000101 # TGS_RenewReq 0x00000102 # TGS_ValidateReq 0x00000103

																    event_class(5)
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