05-20-2013
Compare multiple files, identify common records and combine unique values into one file
Good morning all,
I have a problem that is one step beyond a standard awk compare.
I would like to compare three files which have several thousand records against a fourth file. All of them have a value in each row that is identical, and one value in each of those rows which may be duplicated in the tree files vis a vis the fourth
What I want to see is:
1) The number of records that is unique in each of three (not in any of the others),
2) The number of records that is not unique in each of three,
3) the number of records in the fourth that is NOT in any of the other three;
4) An output file with the full row of each unique record across all the files
These are all text files.
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opendiff(1) BSD General Commands Manual opendiff(1)
NAME
opendiff -- Use FileMerge to graphically compare or merge file or directories
SYNOPSIS
opendiff file1 file2 [-ancestor ancestorFile] [-merge mergeFile]
opendiff dir1 dir2 [-ancestor ancestorDirectory] [-merge mergeDirectory]
DESCRIPTION
opendiff is a command line utility that provides a convenient way to launch the FileMerge application from Terminal to graphically compare
files or directories. If FileMerge is already running, opendiff will connect to that running instance for the new comparison. opendiff
exits immediately after the comparison request has been sent to FileMerge.
opendiff and FileMerge can be used to compare two files file1 and file2 or to compare two directories dir1 and dir2.
If the -ancestor flag is given, FileMerge will compare the two files or directories to a common ancestor. This is useful if two people inde-
pendently modify copies of a single original file or directory.
FileMerge lets you merge two files or directories together to create a third file or directory. To see the contents of a merged file, drag
the splitter bar at the bottom of FileMerge's file comparison window. The contents of the merged file can be directly edited within File-
Merge. After editing, the merged file can be saved to the file (or into the directory) specified with the Fl merge flag. If a destination
is not specified with the -merge flag, FileMerge will ask for a destination file or directory when you try to save a merged file.
For further information, please consult the Help information available from the FileMerge application.
FILES
/Developer/Applications/Utilities/FileMerge.app
opendiff and FileMerge are installed as part of the Mac OS X Developer Tools.
SEE ALSO
diff(1), diff3(1), cmp(1)
Mac OS X August 3, 2004 Mac OS X