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Full Discussion: sort and semi-duplicate row - keep latest only
Top Forums Shell Programming and Scripting sort and semi-duplicate row - keep latest only Post 302274621 by LisaS on Thursday 8th of January 2009 02:53:16 AM
Old 01-08-2009
sort and semi-duplicate row - keep latest only
I have a pipe delimited file. Key is field 2, date is field 5 (as example, my real file is more complicated of course, but the KEY and DATE are accurate)
There can be duplicate rows for a key with different dates.
I need to keep only rows with latest date in this case.
Example data:
W|AAA|DD|D|20080101
W|BBB|CC|C|20080101
W|AAA|BB|B|20080201
W|CCC|DD|D|20080701
W|CCC|EE|E|20080801
W|AAA|DD|D|20081231

I would want to see:
W|AAA|DD|D|20081231
W|BBB|CC|C|20080101
W|CCC|EE|E|20080801

I want to use sort for this but am open to other options. I'm guessing awk could be involved, but I'm bad at writing awk.
I've searched but didn't find anything that seemed to match.
Ideas?


edit to add a little more info:
It could be that I have rows with same key and same date. In that case, I'd prefer to take the one that is last in the file (because of differences in the other fields of the rows and how the file gets built) -- but if that is not possible I understand.
Last edited by LisaS; 01-08-2009 at 04:36 AM..
 

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LEARN ABOUT REDHAT

xcmssetcccofcolormap

XcmsCCCOfColormap(3X11) 					  XLIB FUNCTIONS					   XcmsCCCOfColormap(3X11)

NAME

       XcmsCCCOfColormap, XcmsSetCCCOfColormap - query and modify CCC of a colormap

SYNTAX

       XcmsCCC XcmsCCCOfColormap(display, colormap)
	     Display *display;
	     Colormap colormap;

       XcmsCCC XcmsSetCCCOfColormap(display, colormap, ccc)
	     Display *display;
	     Colormap colormap;
	     XcmsCCC ccc;

ARGUMENTS

       display	 Specifies the connection to the X server.

       ccc	 Specifies the CCC.

       colormap  Specifies the colormap.

DESCRIPTION

       The XcmsCCCOfColormap function returns the CCC associated with the specified colormap.  Once obtained, the CCC attributes can be queried or
       modified.  Unless the CCC associated with the specified colormap is changed with XcmsSetCCCOfColormap, this CCC is used when the specified
       colormap is used as an argument to color functions.

       The XcmsSetCCCOfColormap function changes the CCC associated with the specified colormap.  It returns the CCC previously associated with
       the colormap.  If they are not used again in the application, CCCs should be freed by calling XcmsFreeCCC.  Several colormaps may share the
       same CCC without restriction; this includes the CCCs generated by Xlib with each colormap.  Xlib, however, creates a new CCC with each new
       colormap.

SEE ALSO

       DisplayOfCCC(3X11), XcmsConvertColors(3X11), XcmsCreateCCC(3X11), XcmsDefaultCCC(3X11), XcmsSetWhitePoint(3X11)
       Xlib - C Language X Interface

X Version 11							    Release 6.6 					   XcmsCCCOfColormap(3X11)
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