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Full Discussion: awk : search last index in specific column
Top Forums Shell Programming and Scripting awk : search last index in specific column Post 302868985 by tarun.trehan on Tuesday 29th of October 2013 12:08:08 PM
Old 10-29-2013
Yoda,

Thanks for your reply. Appreciate your inputs.
I have the following queries:

1. i am getting a syntax error around the
Code:
n = match ( $i, /n[^n]*$/ )

..may be i am not pasting the character correctly.

2. This code is scanning all variables and i would like to search only the 4th column. I think i can do that by adding a if clause for i==4.

3. I am onto text mining a huge file set i.e. 10 million records. Is line by line scanning a viable option ??
 

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LEARN ABOUT SUSE

funindex

funindex(1)							SAORD Documentation						       funindex(1)

NAME

       funindex - create an index for a column of a FITS binary table

SYNOPSIS

       funindex <switches>  <iname> [oname]

OPTIONS

	 NB: these options are not compatible with Funtools processing. Please
	 use the defaults instead.
	 -c	   # compress output using gzip"
	 -a	   # ASCII output, ignore -c (default: FITS table)"
	 -f	   # FITS table output (default: FITS table)"
	 -l	   # long output, i.e. with key value(s) (default: long)"
	 -s	   # short output, i.e. no key value(s) (default: long)"

DESCRIPTION

       The funindex script creates an index for the specified column (key) by running funtable -s (sort) and then saving the column value and the
       record number for each sorted row. This index will be used automatically
	by funtools filtering of that column, provided the index file's modification date is later than that of the data file.

       The first required argument is the name of the FITS binary table to index. Please note that text files cannot be indexed at this time.  The
       second required argument is the column (key) name to index. While multiple keys can be specified in principle, the funtools index process-
       ing assume a single key and will not recognize files containing multiple keys.

       By default, the output index file name is [root]_[key].idx, where [root] is the root of the input file. Funtools looks for this specific
       file name when deciding whether to use an index for faster filtering. Therefore, the optional third argument (output file name) should not
       be used for funtools processing.

       For example, to create an index on column Y for a given FITS file, use:

	 funindex foo.fits Y

       This will generate an index named foo_y.idx, which will be used by funtools for filters involving the Y column.

SEE ALSO

       See funtools(7) for a list of Funtools help pages

version 1.4.2							  January 2, 2008						       funindex(1)
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