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Top Forums UNIX for Dummies Questions & Answers file comparison...help needed. Post 302194453 by er_ashu on Tuesday 13th of May 2008 01:11:57 AM
Old 05-13-2008
Quote:
Originally Posted by frozentin
By looking at your 2 examples, why don't you;
[1] loop thru the contents of the 2nd file
[2] compare every individual line of the 2nd file with all the lines in the first
[3] print matched lines to file3
[4] After looping thru all the entries in file2, do a diff between file1 and file_matched
[5] parse the o/p of [4] to file4

Disclaimer: I couldn't script if my life depended on it, so can't really help you with that.
Thanks Frozentin but the issue here is that one of the file (file1 in this case ) has huge no of records and looping and comparing is taking a lot of time.

Is there any alternative way to do this with good performance.

Please advise.
 

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DIFF(1) 						      General Commands Manual							   DIFF(1)

NAME
diff - print differences between two files SYNOPSIS
diff [-c | -e | -C n] [-br]file1 file2 OPTIONS
-C n Produce output that contains n lines of context -b Ignore white space when comparing -c Produce output that contains three lines of context -e Produce an ed-script to convert file1 into file2 -r Apply diff recursively to files and directories of EXAMPLES
diff file1 file2 # Print differences between 2 files diff -C 0 file1 file2 # Same as above diff -C 3 file1 file2 # Output three lines of context with every diff -c file1 file2 # Same diff /etc /dev # Compares recursively the directories /etc and /dev diff passwd /etc # Compares ./passwd to /etc/passwd DESCRIPTION
the same name, when file1 and file2 are both directories" difference encountered" Diff compares two files and generates a list of lines telling how the two files differ. Lines may not be longer than 128 characters. If the two arguments on the command line are both directories, diff recursively steps through all subdirectories comparing files of the same name. If a file name is found only in one directory, a diagnostic message is written to stdout. A file that is of either block special, character special or FIFO special type, cannot be compared to any other file. On the other hand, if there is one directory and one file given on the command line, diff tries to compare the file with the same name as file in the directory directory. SEE ALSO
cdiff(1), cmp(1), comm(1), patch(1). DIFF(1)
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