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Top Forums Shell Programming and Scripting efficiently split a 2GB text file into two Post 302140710 by ihot on Monday 15th of October 2007 03:56:35 PM
Old 10-15-2007
efficiently split a 2GB text file into two

Can an expert kindly write an efficient Linux ksh script that will split a large 2 GB text file into two?
Here is a couple of sample record from that text file:
"field1","field2","field3",11,22,33,44
"TG","field2b","field3b",1,2,3,4

The above rows are delimited by commas.

This script is to search the first field for the word "TG". If that row is present, it is to load that row to a TG.txt file. If this first field is not "TG", then it is to load that row into a NoTG.txt file.

So the result is a new TG.txt with the following row:
"TG","field2b","field3b",1,2,3,4

and a new NoTG.txt with the following row:
"field1","field2","field3",11,22,33,44

Thanks in advance. This forum rocks - with lots of helpful heroes!!
Smilie
 

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fmt(1)								   User Commands							    fmt(1)

NAME
fmt - simple text formatters SYNOPSIS
fmt [-cs] [-w width | -width] [inputfile...] DESCRIPTION
fmt is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the -w width option. The default width is 72. fmt concatenates the inputfiles listed as arguments. If none are given, fmt formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. fmt does not fill nor split lines beginning with a `.' (dot), for compatibility with nroff(1). Nor does it fill or split a set of contiguous non-blank lines which is determined to be a mail header, the first line of which must begin with "From". Indentation is preserved in the output, and input lines with differing indentation are not joined (unless -c is used). fmt can also be used as an in-line text filter for vi(1). The vi command: !}fmt reformats the text between the cursor location and the end of the paragraph. OPTIONS
-c Crown margin mode. Preserve the indentation of the first two lines within a paragraph, and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. -s Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such formatted text, from being unduly combined. -w width | -width Fill output lines to up to width columns. OPERANDS
inputfile Input file. ENVIRONMENT VARIABLES
See environ(5) for a description of the LC_CTYPE environment variable that affects the execution of fmt. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
nroff(1), vi(1), attributes(5), environ(5) NOTES
The -width option is acceptable for BSD compatibility, but it may go away in future releases. SunOS 5.10 9 May 1997 fmt(1)
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