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Top Forums Shell Programming and Scripting Add fields in different files only if some fields between them match Post 302527847 by murpholinox on Sunday 5th of June 2011 10:44:52 PM
Old 06-05-2011
ok I have something like this..
the problem is that I do not know how to tell if field one AND field two match $line...

Code:
awk -F "," '{print $1, $2}' file1 >a
awk -F "," '{print $1, $2}' file2 >b
cat a b > c
sort -u c > d
cat d | while read line
do
   awk '{if ($1, $2 == '$line') print $0 }' file1 > e 
   awk '{if ($1, $2 == '$line') print $0}' file2  > f

done

paste e f > g
awk '{$4 + $8}' g > h

---------- Post updated at 09:36 PM ---------- Previous update was at 09:34 PM ----------

not to replace...but sum > field3file1+field3file2

---------- Post updated at 09:44 PM ---------- Previous update was at 09:36 PM ----------

Quote:
Originally Posted by rdcwayx
So you'd like to replace col 3 & 4 in file2, if there is match in file1 with col 1&2?
not to replace, but to sum .. x+y

pardon me, not quite good English.
 

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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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