Ubuntu Unleashed 2019 Edition: Covering 18.04, 18.10, 19.04

REISUB feature, 210 – 211

relational databases

explained,   514 – 516

flat    files   versus,  512 – 513

relaying mail, 595 – 596

release command, 664

release-build command, 665

remote system access

login/logout,    127 – 128

resources   for information,     399

SSH (Secure Shell)

installing,  393

key-based   logins,  395 – 397

scp command,     394 – 395

sftp    command,     395

tools,   393 – 394

Telnet

installing,  391 – 393

SSH versus,  393

VNC (Virtual    Network Computing),  397 – 399

removable storage media for backups, 328 – 329

removing

database    users   (PostgreSQL),    528

directories,     148 – 149 ,     179

files,   148 – 149 ,     179

jobs,    245

snaps,   122

software. See software  management

user    accounts,    155