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Top Forums Shell Programming and Scripting Finding total distinct count from multiple csv files through UNIX script Post 303002569 by Don Cragun on Monday 28th of August 2017 03:25:43 AM
Old 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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VK_LOGMERGE(1)						      General Commands Manual						    VK_LOGMERGE(1)

NAME
vk_logmerge - a Valgrind XML log file merger SYNOPSIS
vk_logmerge [flags and input files in any order] DESCRIPTION
vk_logmerge is a valkyrie(1) helper. Given multiple log files (in xml format) generated by multiple runs on a parallel machine, or multiple log files generated by sequential runs on a single-processor machine, for the same binary, vk_logmerge merges the log files together, sum- ming the counts of duplicates, and outputs the result to a single file. As input, vk_logmerge expects the log-files to-be-merged and/or a file containing the list of log-files to-be-merged, with each entry on a separate line. Log files can be merged from within valkyrie(1) , or use can invoke vk_logmerge directly. OPTIONS
-h Show help message -v Be verbose (more -v's give more) -t Output plain text (non-xml) -f <log_list> Obtain input files from <log_list> file (one per line) -o <writefile> File to write output to At least 1 input file must be given. If no '-o outfile' is given, writes to standard output. EXAMPLES
vk_logmerge log1.xml -f loglist.fls -o merged.xml SEE ALSO
valkyrie(1), valgrind(1). AUTHOR
vk_logmerge was written by Donna Robinson, Cerion Armour-Brown and others. This manual page was written by Hai Zaar <haizaar@haizaar.com>, for the Debian project (but may be used by others). 2009-05-02 VK_LOGMERGE(1)
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