default values, setting, 246 - 247
multiple parameters, retrieving, 248 - 249
positional parameters, 246
parsing
data from webpages, 433
HTML elements, 434 - 435
passing by reference, 253
passing values to functions, 244 - 250
arguments, 244 - 246
password prompt, 32
passwords, changing, 32 - 33
path directories, checking, 270 - 271
patterns for regular expressions
anchor characters, 324 - 325
asterisk, 329
braces, 330 - 331
character classes, 326 - 327
dot character, 325 - 326
grouping, 331 - 332
pipe symbol, 331
plain text, 321 - 323
plus sign, 330
question mark, 330
ranges, 328 - 329
special characters, 323
performing repetitive tasks, 131
peripherals
cases, 17 - 18
cords, troubleshooting, 24
network cables, 18 - 19
plugging in, 21 - 23
purchasing, 19
required peripherals, 11 - 16
keyboard, 16
output display, 15 - 16
power supply, 13 - 15
SD card, 12 - 13
SD card, transferring operating system to, 21
self-powered USB hub, 18
USB mouse, 18
verifying operation, 21 - 23