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[ask]how to compare line number

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# 1  
Old 06-14-2011
[ask]how to compare line number
dear all,

i need help about this case

i have line number extract in file fileA.txt like this:
231
123
444
231
213
...
now i want to compare the line number fileA.txt to find other file in fileB.txt
exp: if i use one by one like this:
cat fileB.txt | sed -n -e "444"p
huff...is not efisien for a lot of line number
i want like this
VARIABLE=$(awk 'BEGIN { print $1 }' fileA.txt); cat fileB.txt | sed -n -e "$VARIABLE"p
but this script not be useSmilie

any one can help me for this case....

thx before
# 2  
Old 06-14-2011
Quote:
now i want to compare the line number fileA.txt to find other file in fileB.txt
Excuse me but it's impossible to comprehend.
# 3  
Old 06-15-2011
Code:
while read line
do
 echo -n "$line : "
 awk -v line_no=$line '{ if (NR == line_no) print $0}' B.txt
done < A.txt

# 4  
Old 06-15-2011
Code:
awk 'NR==FNR{a[$1];next} NR in a ' fileA.txt fileB.txt

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