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Full Discussion: Comparing the files
Top Forums Shell Programming and Scripting Comparing the files Post 302683451 by RudiC on Wednesday 8th of August 2012 04:30:12 AM
Old 08-08-2012
As mentioned in my post, error checking was omitted, and it was based on the assumption of files of equal length.
diff is great at finding missing lines:
Code:
diff file1 file2
3c3
< 29123975Ç2012-05-29Ç35310126Ç00000000000469744804Ç00010Ç20Ç390ÇÇÇÇF
---
> 2923975Ç2012-05-29Ç35310126Ç00000000000469744804Ç00010Ç20Ç390ÇÇÇÇF
7d6
< 29123979Ç2012-05-29Ç35310130Ç00000000000469744903Ç00010Ç20Ç401ÇÇÇÇF
8a8
> 29123981Ç2012-05-29Ç35310132Ç00000000000469744929Ç00010Ç20Ç390ÇÇÇÇF

which you read like line 7 of file1 doesn't exist in file2, and line 8 vice versa.
So you could do a diff first to find out line differences in the files and then execute the awk script to find field differences. To me it seems inadequate to duplicate existing diff functionality using awk.

---------- Post updated at 10:30 AM ---------- Previous update was at 10:12 AM ----------

Actually you could do sth. like
Code:
(diff -e file1 file2; echo w)|ed file1

to add missing lines to file1, but you would need to remove the change (e.g. 3c3) commands, e.g. by piping it through sed: |sed '/.c/,+1d'

Last edited by RudiC; 08-08-2012 at 05:38 AM..
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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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