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Full Discussion: Merge two files with different lengths
Top Forums Shell Programming and Scripting Merge two files with different lengths Post 302796587 by ClaraW on Friday 19th of April 2013 09:19:03 PM
Old 04-19-2013
Merge two files with different lengths
Hi there,

I have two very long files like:

file1: two fields

Code:
1 123 
1 125
1 234
2 123
2 234
2 300
2 312
3 10
3 215
4 56
...

file2: 6 fields

Code:
1 123 0 1 0 0
1 126 2 1 0 0
2 123 0 1 0 1
2 138 1 1 1 1
2 300 0 1 2 3
2 311 2 4 6 0
3 120 3 4 1 0
3 215 1 1 2 1
3 216 0 2 1 5
3 345 8 0 1 0
3 357 0 1 1 1
3 500 2 1 0 1
4 17  6 1 0 2
4 70  0 1 0 1
...

The numbers of lines in file1 and file2 are not equal.

I want to get an output file like

file3: 6 fields, and the first two fields are exactly the same as the first two fields in file1. For example, the line with the first two field "1 123" has a match in file2: "1 123 0 1 0 0", then print the whole line in file2:"1 123 0 1 0 0" to file3. If one line in file1 does not have a match in file2, e.g. "1 125", then print "1 125 0 0 0 0" to file3.

Code:
1 123 0 1 0 0
1 125 0 0 0 0 
1 234 0 0 0 0
2 123 0 1 0 1
2 234 0 0 0 0
2 300 0 1 2 3
2 312 0 0 0 0
3 10  0 0 0 0
3 215 1 1 2 1
4 56  0 0 0 0
...

I am wondering if this can be done using awk or join or any other in linux? Since the files are very large, I really want it to be fast. Thanks a lot~~~

Note: Field 2 in both file1 and file2 has only number values, but field 1 in both files may have characters too. The two fields are sorted. And in both files, this kind of situation will not happen, no duplicates.

Code:
1 123
1 123
...

Also we do not need to consider the lines in file2 which do not have any match in file1, for example "1 126 2 1 0 0" (no match in file1), then this line should not be added to file3.
Last edited by ClaraW; 04-26-2013 at 08:38 PM..
 

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LEARN ABOUT SUNOS

comm

comm(1) 							   User Commands							   comm(1)

NAME

       comm - select or reject lines common to two files

SYNOPSIS

       comm [-123] file1 file2

DESCRIPTION

       The comm utility reads file1 and file2, which must be ordered in the current collating sequence, and produces three text columns as output:
       lines only in file1; lines only in file2; and lines in both files.

       If the input files were ordered according to the collating sequence of the current locale, the lines  written  will  be	in  the  collating
       sequence of the original lines. If not, the results are unspecified.

OPTIONS

       The following options are supported:

       -1	Suppresses the output column of lines unique to file1.

       -2	Suppresses the output column of lines unique to file2.

       -3	Suppresses the output column of lines duplicated in file1 and file2.

OPERANDS

       The following operands are supported:

       file1	A path name of the first file to be compared. If file1 is -, the standard input is used.

       file2	A path name of the second file to be compared. If file2 is -, the standard input is used.

USAGE

       See largefile(5) for the description of the behavior of comm when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

EXAMPLES

       Example 1: Printing a list of utilities specified by files

       If file1, file2, and file3 each contain a sorted list of utilities, the command

       example% comm -23 file1 file2  | comm -23 - file3

       prints a list of utilities in file1 not specified by either of the other files. The entry:

       example% comm -12 file1 file2 | comm -12 - file3

       prints a list of utilities specified by all three files. And the entry:

       example% comm -12  file2 file3 | comm -23 -file1

       prints a list of utilities specified by both file2 and file3, but not specified in file1.

ENVIRONMENT VARIABLES

       See  environ(5)	for  descriptions  of  the  following  environment  variables that affect the execution of comm: LANG, LC_ALL, LC_COLLATE,
       LC_CTYPE, LC_MESSAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	All input files were successfully output as specified.

       >0	An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cmp(1), diff(1), sort(1), uniq(1), attributes(5), environ(5), largefile(5), standards(5)

SunOS 5.10							    3 Mar 2004								   comm(1)
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