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Top Forums Shell Programming and Scripting Compare multiple fields in file1 to file2 and print line and next line Post 302297483 by cfajohnson on Friday 13th of March 2009 02:44:22 PM
Old 03-13-2009
Quote:
Originally Posted by gillesc_mac
I have two files that I need to compare and print out the line from file2 that has the first 6 fields matching the first 6 fields in file1. Complicating this are the following restrictions

1. file1 is only a few thousand lines at most and file2 is greater than 2 million
2. I need to match the first 6 fields (in order) of each line in file1 to the first 6 fields (in order) in a line in file2 and print the matched line from file2 along with the next line in file2.

You really need GNU grep for this.

Put the fields you want to search for from file1 in another file, and use the -f and -A options to grep:

Code:
cut -d ' ' -c1-6 > file3
grep -f file3 -A1 file2

 

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diff3(1)						      General Commands Manual							  diff3(1)

NAME
diff3 - 3-way differential file comparison SYNOPSIS
file1 file2 file3 DESCRIPTION
compares three versions of a file, and prints disagreeing ranges of text flagged with these codes: all three files differ file1 is different file2 is different file3 is different The type of change required to convert a given range of a given file to some other is indicated in one of these ways: Text is to be appended after line number n1 in file f, where f = or Text is to be changed in the range line n1 through line n2. If n1 = n2, the range can be abbreviated to n1. The original contents of the range follows immediately after a indication. When the contents of two files are identical, the contents of the lower-numbered file is suppressed. Produces a script for the editor that can be used to incorporate into file1 all changes between file2 and file3 (see ed(1)); i.e., the changes that normally would be flagged and Produces a script to incorporate only changes flagged Produces a script to incorporate only changes flagged Produces a script that will incorporate all changes between file2 and file3, but treat overlapping changes (that is, changes that would be flagged with in normal listing) differently. The overlapping lines in both files will be inserted by the edit script bracketed by and lines. Produces a script that will incorporate only changes flagged , but treat these changes in the manner of option. The following command applies the resulting script to file1. EXTERNAL INFLUENCES
International Code Set Support Single- and multi-byte character code sets are supported. WARNINGS
Text lines that consist of a single period defeat Files longer than 64K bytes do not work. FILES
SEE ALSO
diff(1). diff3(1)
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