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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JOIN(1) General Commands Manual JOIN(1)
NAME
join - relational database operator
SYNOPSIS
join [-an] [-e s] [-o list] [-tc] file1 file2
DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If file1 is `-', the standard
input is used.
File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in
each line.
There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con-
sists of the common field, then the rest of the line from file1, then the rest of the line from file2.
Fields are normally separated by blank, tab or newline. In this case, multiple separators count as one, and leading separators are dis-
carded.
These options are recognized:
-an In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2.
-e s Replace empty output fields by string s.
-o list
Each output line comprises the fields specified in list, each element of which has the form n.m, where n is a file number and m is a
field number.
-tc Use character c as a separator (tab character). Every appearance of c in a line is significant.
SEE ALSO
sort(1), comm(1), awk(1).
BUGS
With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort.
The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous.
7th Edition April 29, 1985 JOIN(1)