extract particular lines from text file

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# 1  
extract particular lines from text file

I have two files

file A which have a number in every row and file B which contains few hundred thousand rows with about 300 characters in each row (csv)

What I need is to extract whole rows from B file (only these which numbers are indicated in A file)

I also need to use cygwin.

Any help will be appreciated.
# 2  
It will be good if you show a sample input and desired output???
# 3  
A file input:


B file input 

desired output

# 4  

awk -F"|" 'NR==FNR{arr[FNR]=$0;next}{for(i in arr)if(i==$1)print arr[i]}' fileB fileA

# 5  
A sed version :

for i in `cat file1.txt`
sed -n "$i p" file2.txt >> op.txt

# 6  
Originally Posted by malcomex999

awk -F"|" 'NR==FNR{arr[FNR]=$0;next}{for(i in arr)if(i==$1)print arr[i]}' fileB fileA

thx, awk version works fine for me
# 7  

This is an alternative if you have more file than memory can hold. This only holds the indexes in memory instead of the data file...

awk 'NR==FNR{arr[$1]=0;next} (FNR in arr){print $0}' fileA fileB

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