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Full Discussion: Print last occurrence if first field match
Top Forums Shell Programming and Scripting Print last occurrence if first field match Post 302145820 by vgersh99 on Thursday 15th of November 2007 09:50:23 AM
Old 11-15-2007
assuming your input is sorted based on the first column...

nawk -f ray.awk myInputFile

ray.awk:
Code:
# if the value in the first column ($1) does not equal the value stored in "prevIDX"
# and we are not at the FIRST record (FNR != 1) [FNR = RecordNumber in the current File]- print the value of "prev"
$1 != prevIDX && FNR != 1 { print prev}

# assign the value of the FIRST field ($1) to a variable "prevIDX"
# assign the entire record/line to the variable "prev"
{ prevIDX=$1; prev=$0 }

# after ALL the records/lines were processed - print the value of the variable "prev" 
# the last/dangling record/line
END { print prev }

Last edited by vgersh99; 11-15-2007 at 11:17 AM..
 

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LEARN ABOUT OPENSOLARIS

prev

PREV(1)                                                              [nmh-1.5]                                                             PREV(1)

NAME

       prev - show the previous message

SYNOPSIS

       prev [+folder] [-showproc program] [-showmimeproc program] [-header | -noheader] [-checkmime | -nocheckmime] [switches for showproc or
            showmimeproc] [-version] [-help]

DESCRIPTION

       Prev performs a show on the previous message in the specified (or current) folder.  Like show, it passes any switches  on  to  the  program
       named by showproc or showmimeproc, which is called to list the message.  This command is almost exactly equivalent to "show prev".  Consult
       the manual entry for show(1) for all the details.

FILES

       $HOME/.mh_profile          The user profile

PROFILE COMPONENTS

       Path:                To determine the user's nmh directory
       Current-Folder:      To find the default current folder
       showproc:            Program to show non-MIME messages
       showmimeproc:        Program to show MIME messages

SEE ALSO

       show(1), next(1)

DEFAULTS

       `+folder' defaults to the current folder
       `-checkmime'
       `-header'

CONTEXT

       If a folder is specified, it will become the current folder.  The message that is shown (i.e.,  the  previous  message  in  sequence)  will
       become the current message.

BUGS

       prev  is  really  a link to the show program.  As a result, if you make a link to prev and that link is not called prev, your link will act
       like show instead.  To circumvent this, add a profile-entry for the link to your nmh profile and add the argument prev to the entry.

MH.6.8                                                             11 June 2012                                                            PREV(1)
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