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Filter records in a huge text file from a filter text file

 
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# 1  
Old 10-03-2014
Filter records in a huge text file from a filter text file
Hi Folks,

I have a text file with lots of rows with duplicates in the first column, i want to filter out records based on filter columns in a different filter text file.
bash scripting is what i need.

Data.txt
Code:
Name OrderID Quantity
Sam 123 300
Jay 342 498
Kev 78 2500
Sam 420 50
Vic 10 50
Jay 67 200
Kev 54 400
Jay 45 1000
Jay 90 500
Eli 67 90
Kev 99 430
.......................

Filter file contains:
Filter.txt
Code:
Name
Jay
Vic

ouput file should be:
Out.txt
Code:
Name	OrderID	Quantity
Vic	10	50
Jay	342	498
Jay	67	200
Jay	45	1000
Jay	90	500

Appreciate your help guys.
Last edited by tech_frk; 10-03-2014 at 02:08 AM..
# 2  
Old 10-03-2014
Code:
#!/bin/sh
while read line
do
  firstword=`echo "$line" | awk '{ print $1 }'`
  if egrep "^$firstword\$" filterfile.txt
  then
    echo "$line"
  fi
done

Depending on your OS, you might need to use grep, egrep, or grep -e.
This will be pretty slow if your filter list get's excessively long, but will scale well enough regardless of file size as it doesn't pull everything into memory.
This User Gave Thanks to Smiling Dragon For This Post:
tech_frk
# 3  
Old 10-03-2014
Code:
awk 'FNR==NR{A[$1];next}$1 in A' Filter.txt Data.txt >Out.txt

---------- Post updated at 11:42 AM ---------- Previous update was at 11:39 AM ----------

For given sample this also will work

Code:
grep -f Filter.txt Data.txt

This User Gave Thanks to Akshay Hegde For This Post:
tech_frk
# 4  
Old 10-03-2014
Guys awesome thank you very much.
 
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