Ubuntu Unleashed 2019 Edition: Covering 18.04, 18.10, 19.04

e2fsck  command,     419

hdparm  command,     417 – 418

tune2fs command,     419

types   of  file    systems,     416

kernel,  420 – 421

MySQL,   423

key buffer  usage,   423 – 424

query   cache,   424 – 426

query   optimization,    426

read    buffer  usage,   426

table   cache,   426

resources   for information,     427

Perl, 690

permissions

ACLs,    145 – 146

assigning,   140

changing,    220

chgrp   command,     143

chmod   command,     141 – 142 ,     165

chown   command,     143

umask   command,     143

directory   permissions,     141

examining,   139

Fetchmail,   600

group   permissions,    advantages  of,  221

resources   for information,     242

root    permissions,    granting    temporarily,     234 – 239

set user    ID/set  group   ID,  144 – 145

sticky  bit,     145