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Top Forums Shell Programming and Scripting Using an awk script to identify dupes in two files Post 302498911 by gimley on Tuesday 22nd of February 2011 10:05:55 PM
Old 02-22-2011
Using an awk script to identify dupes in two files

Hello,

I have two files. File1 or the master file contains two columns separated by a delimiter:
Code:
a=b
b=d
e=f
g=h

File 2 which is the file to be processed has only a single column
Code:
a
h
c
b

What I need is an awk script to identify unique names from file 2 which are not found in the master file

The desired output would be:
Code:
h
c

The master file is huge around 1,50,000 lines
The script I had written bu which did not work satisfactorily is as under:

# Use to match items present in 2 text databases
Code:
BEGIN {FS="="}
{
#Master file
if (ARGIND==1) {count[$1]=$2;}    
# Second file
if (ARGIND==2) {count2[$1]=$0;}   

}
END
{

for (i in count) 
#To show matching items. Commented
#if (count2[i] != "") {print count2[i]} 
To show items that do not match the master database
#if (count2[i] == "") {print count2[i]} 
}

It does show the uniks but also spews out the non-unique words.
Any help would be most appreciated. Please help since my dictionary work is halted

Many thanks in advance,

GIMLEY

Last edited by Franklin52; 02-23-2011 at 03:26 AM.. Reason: Please use code tags, thank you
 

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CUT(1)							      General Commands Manual							    CUT(1)

NAME
cut - select out columns of a file SYNOPSIS
cut [ -b | -c] list [file...] cut -f list [-d delim] [ -s] OPTIONS
-b Cut specified bytes -c Select out specific characters -d Change the column delimiter to delim -f Select out specific fields that are separated by the -i Runs of delimiters count as one -s Suppres lines with no delimiter characters, when used EXAMPLES
cut -f 2 file # Extract field 2 cut -c 1-2,5 file # Extract character columns 1, 2, and 5 cut -c 1-5,7- file # Extract all columns except 6 DESCRIPTION
[file...]" delimiter character ( see delim)" with the -f option. Lines with no delimiters are passwd through untouched" Cut extracts one or more fields or columns from a file and writes them on standard output. If the -f flag is used, the fields are sepa- rated by a delimiter character, normally a tab, but can be changed using the -d flag. If the -c flag is used, specific columns can be specified. The list can be comma or BLANK separated. The -f and -c flags are mutually exclusive. Note: The POSIX1003.2 standard requires the option -b to cut out specific bytes in a file. It is intended for systems with multi byte characters (e.g. kanji), since MINIX uses only one byte characters, this option is equivalent to -c. For the same reason, the option -n has no effect and is not listed in this man- ual page. SEE ALSO
sed(1), awk(9). CUT(1)
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