What is the difference between the commands test -e path and test -f path?

They are equivalent options with the same behaviour.
The -f option tests for a regular file. The -e option tests for an empty file.
Both options check the existence of the path. The -f option also confirms that it is a regular file.
The -f option tests for a regular file. The -e option tests for an executable file.

Answer(s): C

Which of the following commands moves and resumes in the background the last stopped shell job?

Answer(s): B

What is the effect of the egrep command when the -v option is used?

Answer(s): B

When running the command
sed -e "s/a/b/" /tmp/file >/tmp/file
While /tmp/file contains data, why is /tmp/file empty afterwards?

The file order is incorrect. The destination file must be mentioned before the command to ensure redirection.
The command sed did not match anything in that file therefore the output is empty.
When the shell establishes the redirection it overwrites the target file before the redirected command starts and opens it for reading.
Redirection for shell commands do not work using the > character. It only works using the | character instead.

Answer(s): C

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