Chapter 3: Security

1. C. The dd command is used to create disk images, among other things. In this case, the input file is /dev/sda1 and the output file is output.img. It’s also common to add the blocksize option by using the bs argument, such as bs=1M.
2. C. The tail command provides the end portion of the file given as an argument. Adding the -f option will cause the output to update as new lines are added to the file being tailed.
3. A. The xz command can compress and decompress files in a variety of formats, one of which is LZMA.
4. A. The chgrp command can be used to change group ownership of a file. The order is chgrp <groupname> <target>.
5. C. The -S option displays output in a format such as u=rwx,g=rx,o=rx. The other options listed do not exist.
6. D. The /srv hierarchy is used for data for server programs. The /etc hierarchy is configuration information, while /var is also data files but variable files such as mail spool files. The /tmp directory is for temporary files....