01-26-2012
Join and awk max column
Hi Friends,
I have a file1 with 3400 records that are tab separated and I have a file2 with 6220 records. I want to merge both these files. I tried using join file1 and file2 after sorting. But, the records should be (3400*6220 = 21148000). Instead, I get only around 11133567. Is there anything that I am doing wrong. Also, is there a way to join each record in file1 to each record in file2 using awk?
File1
a b c d
e f g h
File2
1 2 3 4
5 6 7 8
Output
a b c d 1 2 3 4
a b c d 5 6 7 8
e f g h 1 2 3 4
e f g h 5 6 7 8
Also, can some tell me how to find the max of column in awk. I tried the following one...
awk 'max=="" || $2 > max {max=$2} END{ print max}' FS=" " input.txt
But, that gives only for numerical values. And, I have a mix of numbers and characters in column6. Ex: xyz_123 to xyz_4453. But, the max on $6 is showing to be xyz_999.
Thanks in advance.
All helps appreciated.
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merge(1) merge(1)
NAME
merge - three-way file merge
SYNOPSIS
merge [-Llabel1 [-Llabel3]] [-p] [-q] file1 file2 file3
DESCRIPTION
merge incorporates all changes that lead from file2 to file3 into file1. The result goes to standard output if -p is present, into file1
otherwise. merge is useful for combining separate changes to an original. Suppose file2 is the original, and both file1 and file3 are
modifications of file2. Then merge combines both changes.
An overlap occurs if both file1 and file3 have changes in a common segment of lines. On a few older hosts where diff3 does not support the
-E option, merge does not detect overlaps, and merely supplies the changed lines from file3. On most hosts, if overlaps occur, merge out-
puts a message (unless the -q option is given), and includes both alternatives in the result. The alternatives are delimited as follows:
<<<<<<< file1 lines in file1 ======= lines in file3 >>>>>>> file3
If there are overlaps, the user should edit the result and delete one of the alternatives. If the -L label1 and -L label3 options are
given, the labels are output in place of the names file1 and file3 in overlap reports.
DIAGNOSTICS
Exit status is 0 for no overlaps, 1 for some overlaps, 2 for trouble.
IDENTIFICATION
Author: Walter F. Tichy.
Revision Number: 1.1.6.2; Release Date: 1993/10/07.
Copyright (C) 1982, 1988, 1989 by Walter F. Tichy.
Copyright (C) 1990, 1991 by Paul Eggert.
SEE ALSO
diff3(1), diff(1), rcsmerge(1), co(1)
merge(1)