Question

This is my code:

grep $to_check $forbidden >${dir}variants_of_interest;

cat ${dir}variants_of_interest | (while read line; do 
     #process ${line} and echo result
done;
)

Thank to grep I get lines of data that I then process separately in loop. I would like to use variable instead of using file variants_of_interest.

Reason for this is that I am afraid that writing to file thousands of time (and consequently reading from it) rapidly slows down computation, so I am hoping that avoiding writing to file could help. What do you think?

I have to do thousands of grep commands and variants_of_interest contains up to 10 lines only.

Thanks for your suggestions.

Answer 1

You dont have to write a file. Simply iterate over the result of grep:

grep $to_check $forbidden | (while read line; do 
     #process ${line} and echo result
done;
)