SIMULATION - Find the rows that contain abcde from file /etc/testfile, and write it to the file/tmp/testfile, and the sequence is requested as the same as /etc/testfile.
There is no specified if the content of destination file can be replaced. So i suppose that it can.. in that case these commands are correct:
cat /etc/testfile | grep abcde > /tmp/testfile
OR
grep abcde /etc/testfile > /tmp/testfile
In case that content of destination file should not be replaced, following command will work:
cat /etc/testfile | while read line; do echo $line | grep abcde | tee -a /tmp/testfile; done
There is missing ";" in "correct answer" here, so the command from there will work if you will copy paste it but if you need to write it on your own, you must add the ";" or use bash script!
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