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Still code is not working on my pc.
i think its not a space its a tab.

I have below file. I want to remove space at begining of every line and then after also remove blank line from file.
I use below code for each operation.

sed -e 's/^[ \t]*//' < check.txt >...

I have a below file.

INPUT FILE
select * from customer
MERGE INTO Archive; delete from Employee; using select * from customer;
delete from employee; select * from Employee;
insert into...