grep abcde /etc/testfile > /tmp/testfile

cat /etc/testfile | grep "abcde" > /tmp/testfile

awk '/abcde/ {print}' /etc/testfile >> /tmp/testfile

this is my error message after i executed the command grep abcde /etc/testfile > /tmp/testfil "grep : /etc/testfile: Is a directory"

#grep "abcde" /etc/testfile > /tmp/testfile

#touch /tmp/testfile - if file doesn't exists #grep abcde /etc/testfile > /tmp/testfile #cat /tmp/testfile - to verfy

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!

grep -w "abcde" /etc/testfile >> /tmp/testfile

grep ^abcde$ /etc/testfile > /tmp/testfile

grep abcde /etc/testfile | tee /tmp/testfile

cat /etc/testfile | grep abcde > /tmp/testfile OR grep abcde /etc/testfile > /tmp/testfile

cat /etc/tesfile | grep abcde > /tmp/testfile