I am facing some strange problem.
I know, there is only one record in a file 'test.txt' which starts with 'X'
I ensure that with following command,
awk /^X/ test.txt | wc -l
This gives me output = '1'.
Now I take out this record out of the file, as follows :
awk /^X/ test.txt > XRecord.txt
Then I take out all records which do not start with 'X'.
Following is the command for the same,
awk '$0!~/^X/ test.txt > NotXRecord.txt
After doing this, Number of records with NotXRecord.txt is not 1 record less than number of records with 'test.txt'.
Now the same sequence above, works fine with small files, say uptil 100 thousands of records.
But it do not work for a file, with 4million rows.
Does any one have valuable hints to share?