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Top Forums Shell Programming and Scripting Replace line in file with line in another file based on matching string Post 302588471 by luckycharm on Monday 9th of January 2012 04:53:36 AM
Old 01-09-2012
Replace line in file with line in another file based on matching string

Hi

I am not the best scripter in the world and have run into a issue which you might be able to guide me on...

I have two files.

File1 :
Code:
A123, valueA, valueB
B234, valueA, valueB
C345, valueA, valueB
D456, valueA, valueB
E567, valueA, valueB
F678, valueA, valueB

File2:
Code:
C345, valueX, valueY
D456, valueX, valueY

I basically want to match the lines in the file1 and file2 based on the value of the first col in both files. If these values match then replace the entry in file1 with the entry in file2

Output:

Code:
A123, valueA, valueB
B234, valueA, valueB
C345, valueX, valueY
D456, valueX, valueY
E567, valueA, valueB
F678, valueA, valueB


Please note file1 is a million lines long so loops and greps take a long time!

Thanks a mil in advance

KB

Last edited by Franklin52; 01-09-2012 at 06:24 AM.. Reason: Please use code tags for code and data samples, thank you
 

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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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