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NOS220 Review (Ch11)

Linux Study Guide - Compression, System Backup, & Software Installation

QuestionAnswer
*sum commands Commands that can be used to verify the checksum on a file where * represents the checksum algorithm. For example, to verify a SHA-1 checksum, you could use the sha1sum command.
/etc/dumpdates The file used to store information about incremental and full backups for use by the dump/restore utility.
archive The location (file or device) that contains a copy of files; it is typically created by a backup utility.
bunzip2 command The command used to decompress files compressed by the bzip2 command.
bzcat command A command used to view the contents of an archive created with bzip2 to SO.
bzip2 command The command used to compress files using a Burrows-Wheeler Block Sorting Huffman Coding compression algorithm.
bzless command A command used to view the contents of an archive created with bzip2 to SO in a page-by-page fashion.
bzmore command A command used to view the contents of an archive created with bzip2 to SO in a page-by-page fashion.
checksum A calculated value that is unique to a file’s size and contents.
compress command The command used to compress files using a Lempel-Ziv compression algorithm.
compression The process in which files are reduced in size by a compression algorithm.
compression algorithm The set of instructions used to reduce the contents of a file systematically.
compression ratio The amount of compression that occurred during compression.
cpio (copy in/out) command A command used to run a common backup utility.
Debian Package Manager (DPM) A package manager used on Debian and Debian-based Linux distributions.
dump command A command used to run a utility that creates full and incremental backups.
full backup An archive of an entire filesystem.
GNU C Compiler (gcc) command The command used to compile source code written in the C programming language into binary programs.
GNU zip (gzip) command A command used to compress files using a Lempel-Ziv compression algorithm.
gunzip command The command used to decompress files compressed by the gzip command.
incremental backup An archive of a filesystem that contains only files that were modified since the last archive was created.
KPackageKit utility A program that can be used to install, update, and remove RPM packages within a desktop environment.
package dependencies A list of packages that are prerequisite to the current package being installed on the system.
package manager A system that defines a standard package format and can be used to install, query, and remove packages.
Red Hat Package Manager (RPM) The most commonly used package manager for Linux.
restore command The command used to extract archives created with the dump command.
rpm command The command used to install, query, and remove RPM packages.
software mirrors Software repositories that host the same RPM or DPM packages as other software repositories for fault tolerance and load balancing of download requests.
software repositories Servers on the Internet that host RPM or DPM packages for download.
system backup The process whereby files are copied to an archive.
tape archive (tar) command The most common command for creating archives.
tarball A gzip-compressed tar archive.
uncompress command The command used to decompress files compressed by the compress command.
yum (Yellowdog Updater Modified) command A program used to install and upgrade software packages.
zcat command A command used to view the contents of an archive created with compress or gzip to SO.
zless command A command used to view the contents of an archive created with compress or gzip to SO in a page-by-page fashion.
zmore command A command used to view the contents of an archive created with compress or gzip to SO in a page-by-page fashion.
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