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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 OSF1

llconvert

llconvert(8)						      System Manager's Manual						      llconvert(8)

NAME

       llconvert - Modify lastlog records from DIGITAL UNIX releases 4.0x and prior to new format

SYNOPSIS

       /usr/lbin/llconvert [-vnrp?h] input_file [output_file]

OPTIONS

       Restore new format to old format.  Verbose. Display lines while converting.  Do not preserve contents of input file.  Formatted print only.
       Do not convert. (May be used with the -r option).  Display usage message.

DESCRIPTION

       The llconvert command reads records from the lastlog file, such as /var/adm/lastlog, and converts the record format to the  updated  struct
       lastlog	format.  If  no  output file is specified or if the output file path is identical to the input file path, llconvert makes a backup
       copy of the original input file using the following algorithm: If filename.orig exists.	Where n is a unique number.

       The llconvert command attempts to detect an input file that is in the wrong format (for example, input file is already a new format  file).
       A warning message is issued in this case, but conversion continues.

RETURN VALUES

       Success.  An error occurred.

EXAMPLES

       To convert an old format accounting file to the new format: llconvert /var/adm/lastlog.prev

	      Upon  completion	of  this  command,  /var/adm/lastlog.prev  will have been converted to the new format. The original /var/adm/last-
	      log.prev is renamed to:

	      /var/adm/lastlog.prev.orig To convert a lastlog file in new format to the old format: llconvert -r  /var/adm/lastlog  /var/adm/last-
	      log.old

FILES

       Lastlog header file that defines the format for the lastlog file.  The active lastlog file.

SEE ALSO

       Commands: finger(1)

																      llconvert(8)
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