Splitting input CSV file into 3 files


 
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# 8  
Old 10-04-2012
looping through infile only once:
Code:
awk 'NR<=3 {print >"file1.csv"; next}
     {A[++i%4]=$0; j=(i+1)%4; if (A[j]) print A[j]>"file3.csv"}
     END {i++; for (j=1;j<=3;j++) print A[++i%4]>"file2.csv"}
    ' infile

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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)