08-28-2017
Are all of your .csv files sorted on field 38? If not, your code won't work. (You will get artificially high counts for the number of distinct values in a file because uniq produces a line of output for each case where a field 38 value changes from the value found on the previous line.)
Does each distinct value in field 38 of all of your files appear in only one or your input files? If not, your code won't work. (You don't have any way to determine which distinct values in a single file appear in one or more of the other files.)
Are you always processing 3 files?
Having 3 files of a megabyte each each should not cause any problem producing a single merged or sorted combined file. Why are you unable to merge them?
Why not just use a single awk script to read all of your files once and produce the output you want for each input file and for the combined input from all of the input files?
Do you really want the number of distinct field 38 values in each input file? Or, do you really just want the number of distinct field 38 values in the merged input files?
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LEARN ABOUT MINIX
fieldcomb
FIELDCOMB(1) General Commands Manual FIELDCOMB(1)
NAME
fieldcomb - combine two or more field frames for video animation
SYNOPSIS
fieldcomb [ -e|-o ][ -r ] [ -f combined.hdr ] field0.hdr field1.hdr ..
DESCRIPTION
Fieldcomb combines two or more field frames into half as many final video frames for field-based animations. Normally, the even scanlines
in the output are given over to the first, third, fifth, etc. pictures given on the input, and the odd scanlines are given over to the sec-
ond, fourth, sixth, etc. pictures on the input. This behavior corresponds to the -e option, which is set by default. To reverse this
ordering, the -o option must be specified.
Normally, fieldcomb will name output frames by dividing the numbers on the input field file names by 2, inserting a 'C' right before the
number, adding leading zeroes to make it always four digits. For example, the command:
fieldcomb anim12.hdr anim13.hdr anim14.hdr anim15.hdr
will produce two output pictures:
animC0006.hdr & animC0007.hdr
If an odd number of input files is given on the command line, the last file is held over and used as the first file in the next invocation
of fieldcomb in the same directory. In this way, the program works well with the "TRANSFER" facility of ranimate(1), which does not guar-
antee an even number of frames will be passed every time.
If only two input files are given, the -f option may be used to specify a different output name of the user's choosing.
If the -r option is specified, then the input files will be removed once they have been combined.
AUTHOR
Greg Ward
ACKNOWLEDGEMENT
Work on this program was sponsored by Iebele Abel.
SEE ALSO
getinfo(1), pcomb(1), pfilt(1), phisto(1), ran2tiff(1), ranimate(1), rpict(1)
RADIANCE
9/6/2005 FIELDCOMB(1)