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the program too slow there is any solution?

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# 1  
Old 10-01-2007
the program too slow there is any solution?
i want to make match between two file:
the first about 1000 records
and the second about 67000 records
I used the nested loop for that the program is two slow
how can i fast this the program

ex:
more file1|while read i
do
more file2|while read x
do
if $parameter1=$parameter2
then .....
fi
done
done
# 2  
Old 10-01-2007
(a) sort the files first, change your algorithm

(b) write the program in C or Perl

shell scripts are *really* bad languages for intensive processing.
# 3  
Old 10-01-2007
the sort is impossible
and my knowledge of c and perl is weak

con you show me an exable in c
# 4  
Old 10-01-2007
Code:
FILE *fp1=fopen("file1.txt","r");
FILE *fp2=fopen("file2.txt","r");
char buf1[256];
char buf2[256];

while (fgets(buf1,sizeof(buf1),fp1))
{
     frewind(fp2);

     while (fgets(buf2,sizeof(buf2),fp2))
     {
            .......
     }
}

# 5  
Old 10-01-2007
thanks porter
# 6  
Old 10-01-2007
There is no such thing as unsortable data. If you can compare the keys, you can sort them. But I would read the 1000 record file into an array. Then read the 2nd file and compare to the elements of the array.
# 7  
Old 10-01-2007
awk is designed to do this using what are called associative arrays.
If you post sample data, say 5 from the small file and 20 from the big, we can give you an example.
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