find lines from one file in the other and print them

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# 1  
Old 08-05-2009
find lines from one file in the other and print them

Hi guys,
please help me to make a loop!

I have two files.

File 1

1 abc
2 cde
3 ghgj
4 kjhn
5 mbm
6 hghj
7 hgjk

I need to write a script that reads lines from File1, finds them in File2 and puts in File3, so File3 should look like this:

2 cde
4 kjhn
7 hgjk

Please please help!
# 2  
Old 08-05-2009
If I get what you're trying to do, something like this should work in Bash:

for searchterm in `cat file1`
grep ^$searchterm file2

I've added one thing that goes slightly beyond your request. The ^ on line 3 makes sure that the search term is found at the *start* of the line in file2, not just anywhere in the line. If that's not what you want, just remove the ^. Best of luck.
# 3  
Old 08-05-2009
As long as the files are ordered by the first column, the join command would the best option.
# 4  
Old 08-05-2009
Thank you! The loop works without ^.
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