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Top Forums UNIX for Dummies Questions & Answers Comparison of 2 files in UNIX Post 302145106 by Dana Evans on Monday 12th of November 2007 10:45:22 PM
Old 11-12-2007
Question

hey DRL thanks a ton!! for your help ..
but again as per the requirement of boss it has to be done using Unix shell script ( plsql if required)Smilie

the files file1 and file2 won't necessarily have the same number of rows .
file1 and file2 have column values of a specific oracle table exported and stored in Unix system on regular basis .
the idea is two compare the contents of the files of previous day and current day ( for e.g file1 is previous day's file and file2 is current day's file) i.e. we got to do row wise comparison of file and detect if there is change in any particular row value if any particular row in file2 (say for e.g row number 3 ) differs from row number 3 of file1 ... then the script should pick up the row num 3 value from file 2 and re-direct it to another third file.

but since we got to verify previous day's and current day's records .. so even if both the files do not have same number of lines ... it won't be a problem as our target is to compare whether a particular row which had some value until yesterday still has the same value today or has it been changed.. in such case the script can compare until it reaches the row end of file1 .
hope i m clear with my question

Last edited by Dana Evans; 11-12-2007 at 11:54 PM..
 

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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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