Merging fields in CSV Post: 302875841

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Top Forums Shell Programming and Scripting Merging fields in CSV Post 302875841 by Don Cragun on Wednesday 20th of November 2013 12:53:12 PM

11-20-2013

Registered User

Hi bharathbangalor,
The sample input file you showed us and the output you said you wanted have tabs as the field separators. But you told Subbeh "More over the fields are coma (sic) separated".

Are you saying your input file has commas instead of tabs as field separators?

Are you saying you want the output to use commas instead of tabs as field separators?

The sample input file you showed us is sorted by key, city, and account. The awk script I provided assumes that all entries in your input file with the same key are on contiguous lines and prints output that is in the same order as the input. The awk script Subbeh provided will work no matter what order the input is in, but (other than the header) prints output lines in random order.

To be sure we're coming up with code that will work for you:

Do all of the input lines for a given id in your real data appear on adjacent lines?
Do you care about the order of the output lines?
What operating system and version are you using? (I.e., what is the output from uname -a?
What is the output from the command getconf LINE_MAX?
Will the length in bytes of any input line (including field separators and the trailing newline character) in your real data exceed the number printed by getconf?
Will the length in bytes of the longest output line you want to produce from your real data exceed the number printed by getconf? If it will, will the number of bytes in the longest output field you want to produce from your real data exceed the number printed by getconf?
And, does every line in your input file have the same number of fields?

Don Cragun

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MONGOEXPORT(1)							  Mongo Database						    MONGOEXPORT(1)

NAME

       mongoexport - the Mongo export tool

SYNOPSIS

       mongoexport [OPTIONS]

DESCRIPTION

       mongoexport  is a tool to export a MongoDB collection to either JSON or CSV. The query can be filtered or a list of fields to output can be
       given.

       If the output is CSV, the fields must be specified in order.

EXAMPLES

       mongoexport -d test -c test1 --csv -f name,num
	      export documents from test.test1 in CSV format

OPTIONS

       --help show usage information

       -h, --host HOST
	      server to connect to (default HOST=localhost)

       -d, --db DATABASE
	      database to use

       -c, --c COLLECTION
	      collection to use

       -q, --query QUERY
	      query filter

       -f, --fields FIELDS
	      comma-separated list of field names

       --csv  export to CSV instead of JSON

       -o, --out FILE
	      output file, if not specified, stdout is used

       --dbpath PATH
	      directly access mongod data files in this path, instead of connecting to a mongod instance

COPYRIGHT

       Copyright 2007-2009 10gen

SEE ALSO

       For more information, please refer to the MongoDB wiki, available at http://www.mongodb.org.

AUTHOR

       Kristina Chodorow

10gen								     June 2009							    MONGOEXPORT(1)