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Top Forums Shell Programming and Scripting File comparison in UNIX columnwise Post 302906896 by Scrutinizer on Tuesday 24th of June 2014 09:37:13 AM
Old 06-24-2014
You are welcome... I just notice you want to use $1 as primary key instead of the line number. Then this adaptation would be required:
Code:
awk -F, '{s=p=x; getline p<f; n=split(p,F)} n<NF{n=NF} {for (i=2; i<=n; i++) if($i!=F[i]) s=s (s?FS:x) i; print $1, s}' f=file2 file1

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GETLINE(3)						   BSD Library Functions Manual 						GETLINE(3)

NAME
getdelim, getline -- get a line from a stream LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdio.h> ssize_t getdelim(char ** restrict linep, size_t * restrict linecapp, int delimiter, FILE * restrict stream); ssize_t getline(char ** restrict linep, size_t * restrict linecapp, FILE * restrict stream); DESCRIPTION
The getdelim() function reads a line from stream, delimited by the character delimiter. The getline() function is equivalent to getdelim() with the newline character as the delimiter. The delimiter character is included as part of the line, unless the end of the file is reached. The caller may provide a pointer to a malloced buffer for the line in *linep, and the capacity of that buffer in *linecapp. These functions expand the buffer as needed, as if via realloc(). If linep points to a NULL pointer, a new buffer will be allocated. In either case, *linep and *linecapp will be updated accordingly. RETURN VALUES
The getdelim() and getline() functions return the number of characters written, excluding the terminating NUL character. The value -1 is returned if an error occurs, or if end-of-file is reached. EXAMPLES
The following code fragment reads lines from a file and writes them to standard output. The fwrite() function is used in case the line con- tains embedded NUL characters. char *line = NULL; size_t linecap = 0; ssize_t linelen; while ((linelen = getline(&line, &linecap, fp)) > 0) fwrite(line, linelen, 1, stdout); ERRORS
These functions may fail if: [EINVAL] Either linep or linecapp is NULL. [EOVERFLOW] No delimiter was found in the first SSIZE_MAX characters. These functions may also fail due to any of the errors specified for fgets() and malloc(). SEE ALSO
fgetln(3), fgets(3), malloc(3) STANDARDS
The getdelim() and getline() functions conform to IEEE Std 1003.1-2008 (``POSIX.1''). HISTORY
These routines first appeared in FreeBSD 8.0. BUGS
There are no wide character versions of getdelim() or getline(). BSD
November 30, 2010 BSD
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