compare two files


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# 1  
compare two files

I have file1 and file2:

file1:

11 xxx kksd ...
22 kkk kdsglg...
33 sss kdfjdksa...
44 kdsf dskjfkas ...
hh kdkf kdkkd..
jg dkf dfkdk ...
...

file2:

jg
22
hh
...

I need to check each line of file1. if the field one is in file2, I will keep it; if not, the whole line will be discarded. The result file will be:

jg dkf dfkdk ...
22 kkk kdsglg...
hh kdkf kdkkd..
...

please tell me how I can do this, thanks!
# 2  
A possible solution :
Code:
awk 'NR==FNR { keys[$1]++ ; next } $1 in keys' file2 file1


Jean-Pierre.
# 3  
Quote:
Originally Posted by aigles
A possible solution :
Code:
awk 'NR==FNR { keys[$1]++ ; next } $1 in keys' file2 file1


Jean-Pierre.
It works on the above question. however, my real problem is more complicated: the file1 is actually an XML file like this:

...
<object
type="user"
id="000039BF228B"
encryptedPassword=""
maxConnections=""
>
<checkListAttributes>
</checkListAttributes>
</object>

...
<object
type="user"
id="0000E2801BFD"
encryptedPassword=""
>
<checkListAttributes>
</checkListAttributes>
</object>
...

and file2 is a list of id, as:

...
000039BF228B
0000E2801BFD
...

I want to delete all the blocks whose id is not in file2, and keep those with id in file2. I think we can change the RS (record separator to </object>), but I do not know how to do the whole job. would you help again?
# 4  
With GNU awk!

Code:
patt="$(printf "id=\"%s\"|" $(<file2))"
awk '$0 ~ patt{print $0RS}' RS="</object>" patt="${patt%|}" file1

# 5  
Quote:
Originally Posted by radoulov
With GNU awk!

Code:
patt="$(printf "id=\"%s\"|" $(<file2))"
awk '$0 ~ patt{print $0RS}' RS="</object>" patt="${patt%|}" file1

how can I enter these two lines as a command, can you make it clear?
# 6  
Quote:
Originally Posted by fredao
how can I enter these two lines as a command, can you make it clear?
I'm not sure that I understand the question, but:

Code:
$ cat file1
<object
type="user"
id="000039BF228B"
encryptedPassword=""
maxConnections=""
>
<checkListAttributes>
</checkListAttributes>
</object>
<object
type="user"
id="0000E2801BFD_NOO"
encryptedPassword=""
>
<checkListAttributes>
</checkListAttributes>
</object>
<object
type="user"
id="0000E2801BFD"
encryptedPassword=""
>
<checkListAttributes>
</checkListAttributes>
</object>

$ cat file2
000039BF228B
0000E2801BFD

$ patt="$(printf "id=\"%s\"|" $(<file2))"
$ awk '$0 ~ patt{print $0RS}' RS="</object>" patt="${patt%|}" file1
<object
type="user"
id="000039BF228B"
encryptedPassword=""
maxConnections=""
>
<checkListAttributes>
</checkListAttributes>
</object>

<object
type="user"
id="0000E2801BFD"
encryptedPassword=""
>
<checkListAttributes>
</checkListAttributes>
</object>

# 7  
I think there is a misunderstanding, as I only want to keep the blocks whose id has a match in the second file. If I have a block as:

object
type="user"
id="999999999999"
encryptedPassword=""
>
<checkListAttributes>
</checkListAttributes>
</object>

and 999999999999 is not in the second file, the whole block should be discarded. but after I run your code, it is still there. any idea?
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