Set user ID (SUID) and Set group ID (SGID) are used to set a file to run as something other than the standard. Normally, when a file is executed, it runs as the user who invokes it. Setting a file to SUID or SGID simply requires adding an extra digit to the permissions. Technically, if no digit is used, it assumes a leading 0.

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Enhanced Capabilities Port (ECP) is a high-speed parallel port developed by Hewlett-Packard and Microsoft in 1992. It offers improved performance for the parallel port and requires special hardware logic. ECP ports support high throughput communications.

ECP is an improved version of Enhanced Parallel Port (EPP). Unlike EPP, ECP supports Direct Memory Access (DMA). The ECP ports can be turned into EPP or standard parallel ports using BIOS. However, it is recommended that the port be placed in ECP mode for the best throughput.

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The CRON daemon executes the CRON jobs at a specified schedule. It constantly checks the queue for the jobs that need to run. All CRON jobs are stored in the /etc/crontab file. For recurring automated jobs, CRON is considered to be the best tool.

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The Debian Package Management System (DEB) is a package manager, which is used to create installation packages from binary code. It works in the same way as RPM. The packages created through DEB use the .deb extension.

3DES, also referred to as triple DES, is a mode of the Data Encryption Standard (DES) encryption algorithm. 3DES uses three 64-bit keys to encrypt data thrice. Primarily, it encrypts data with a 64-bit key. Then, the output data is again encrypted with the second 64-bit key. Finally, the third 64-bit key is used for encryption. DES uses the block cipher method to break a data file into 64-bit blocks, which are then encrypted.

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The sticky bit is a part of a permission set applied to files or folders. The sticky bit prevents others from deleting files from a folder. When the sticky bit is set on a directory, only the owner or root can unlink (delete) or rename the files in that directory. Without the sticky bit, anyone who is able to write to the directory can delete or rename the files.

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ATAPI (AT Attachment Packet Interface) is part of the Enhanced IDE (EIDE) interface (also known as ATA-2). It is an interface between a computer and its attached CD-ROM drives and tape backup drives. Most of the PC computers use the standard Integrated Drive Electronics (IDE) interface to address hard disk drives. ATAPI provides the additional commands needed for controlling a CD-ROM player or tape backup so that the computer can use the IDE interface and controllers to control these relatively newer device types.

SUDO is a Unix/Linux-based utility that provides an efficient way to give specific users permission to use specific system commands at the root level of a Linux operating system.

A hot spare disk is a hard disk drive that is flagged for use in case another drive in the RAID array fails. If a hot spare disk is configured with a RAID array, and a disk in the RAID fails, the hot spare disk is immediately available for the RAID to start rebuilding the RAID data. As soon as the rebuild is completed, the RAID array becomes fully functional without affecting the performance. All the RAIDS (0, 1, 3, 5, etc.) support hot spare disks.

Set user ID (SUID) and Set group ID (SGID) are used to set a file to run as something other than the standard. Normally, when a file is executed, it runs as the user who invokes it. Setting a file to SUID or SGID simply requires adding an extra digit to the permissions. Technically, if no digit is used, it assumes a leading 0.

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