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Full Discussion: Finding total distinct count from multiple csv files through UNIX script
Top Forums Shell Programming and Scripting Finding total distinct count from multiple csv files through UNIX script Post 303002572 by STCET22 on Monday 28th of August 2017 04:46:08 AM
Old 08-28-2017
Hi ,
Please find below my response :
All the csv files are not sorted on field 38 but field 38 contains only numerical values.
Each distinct value appear only in one file.Each distinct value won't be there in multiple files.
We are not processing 3 files only.It can be around 100-120 files.

As all the input files(around 120) can contains data in millions.If system data size exceeds 400gb ,there is chance if system blown up ,that's why we not merging all the files.

We need total distinct count on field 38 on all the files present on the directory.

As I'm relatively new to the scripting area ,can you please help me with the above requirement.Your help will be very much appreciated.
 

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LEARN ABOUT DEBIAN

flow-expire

flow-expire(1)						      General Commands Manual						    flow-expire(1)

NAME

       flow-expire -- Manage storage of flow file archives by expiring old data.

SYNOPSIS

       flow-expire [-h]  [-d debug_level]  [-e expire_count]  [-E expire_size] -w workdir

DESCRIPTION

       The flow-expire utility will remove the oldest flow files in a directory based on either a count of files or space utilization.	The direc-
       tory is recursively searched for flow files.  Files that do not have a flow-tools signature will be ignored.   The  internal  timestamp	is
       used  so backups or copies of the flow files that do not retain the original timestamp will not impact the operation of flow-expire.  flow-
       expire is typically used to manage storage in a distributed environment where flows are collected on  a	different  server  than  they  are
       archived.

OPTIONS

       -d debug_level
		 Enable debugging.

       -e expire_count
		 Retain the maximum number of files so that the total file count is less than expire_count.

       -E expire_size
		 Retain the maximum number of files so that the total storage is less than expire_size.  The letters b,K,M,G can be used as multi-
		 pliers, ie 16 Megabytes is 16M.

       -h	 Display help.

       -w workdir
		 Work in workdir.

EXAMPLES

       Remove the oldest flow files in /flows/krc4 until the total storage is less then 2 Gigabytes.

	 flow-expire -E2Gig -w /flows/krc4

       Remove the oldest flow files in /flows/krc4 until the total number of files is less then 100.

	 flow-expire -e100 -w /flows/krc4

BUGS

       Empty directories are not removed.

AUTHOR

       Mark Fullmer maf@splintered.net

SEE ALSO

       flow-tools(1)

																    flow-expire(1)
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