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2>&1 will redirect standard error to wherever you pointed standard output (i.e. the screen by default) to - but in your case, you wrote it to newfile.

ls will print errors to standard error, by...

head -40 yourfile.txt | tail -10

Hi.

Yes.

The first (cd ~smart) will cd to the home directory or user smart.

The second will cd to a directory called smart in the current user's home directory. cd ~ will cd to the current...