Shell Programming and Scripting

Hi,

Iam having the following situation:

Iam reading one file and taking that line one by one and searching that word in file2 using grep command

read_file1()
{
cat file1| while read line
do
grep $line file2 >> outputfile.dat
done
}

now iam having file 1
q
q
a
s
d

file2
q
q
q
a
s
d

Iam reading file1 and greping that word in file2

Now iam getting duplicates in output file , when iam grepping the same word in file1 multiple times from file2. so how can i avoid this??


Can anybody help??

append "| head -1" to your grep.

Why not remove the duplicates from file1 if that's permitted ?

Code:

sort file1 | uniq | while read line

how we can append???

i triyed this
grep $line old_extract.dat append | head -1 > outputfile

This doesn't worked.

Code:

fgrep -f file1 file2

No . this frep is also not working

Could you post the output you get and the output you want,
given the data you posted above?