How to get this?

[Lakshmipathi]

Hi all,
I'm writing shell script on my own
I'm at the last step in the script i didn't seem to get it right

Here is problem:
I have 2 files.

file1.txt

AAA
BBB
CCC
EE

file2.txt

AAA34
BBB66
CCC
DDD
EE&something
FF
GG

I need output file like,

AAA34
BBB66
CCC
EE&something

How to do this?
I thought about diff and comm ...but doesn't seems to work for me.
Any thoughts ?

[wje_lf]

It's not clear what you're trying to do here.

The output file looks just like the the first, second, third, and fifth lines of the second input file, with the first input file ignored completely.

In other words, I don't think we can guess your intention by just looking at the input and desired output. You'll have to tell us more completely what you want.

[Lakshmipathi]

Ok..this is what i want :
I want to grep lines from file2 which begins with the content of file1.

Example:
I got a file (say file1) which will have few words like,

This 
That
These
line

And another file (file2.txt) has the following contents:
[code]
This is line1.
That is line2 .
These are line3 and 4.
And finally i have
Dont Get this line
[\code]

I want to grep only those lines from file2 which begins with the contents from file1.

the desired output :

This is line1.
That is line2 .
These are line3 and 4.

And these two lines are omiited

And finally i have
Dont Get this line.

because

"And finally i have"

we don't have start wording in file1.

"Dont Get this line"

Though the word "line" is available in file1.
Since this sentence begins with the word "Dont" we skip this too.

Any ideas?

[ghostdog74]

awk 'FNR==NR{
 a[$0]=$0
 next
}
{ 
 for ( items in a ) {
  if ( items ~ $0 ) {
    print items
  }
 }
}' file2 file1

output:

# ./test.sh
AAA34
BBB66
CCC
EE&something

[Lakshmipathi]

i found a solution:

I needed grep with ^ option

	#----- The file to read
        myFile="file1.txt"
        myLine=""

i="1"
 while [ 1 ]
        do
                read myLine || break
		F1=$(echo $myLine | awk '{ print $1 }')

		grep '^'$F1 file2.txt >> file3.txt

  done < $myFile
exit;

so simple
Though i love C cprogramming,shell script is very useful and powerful