[SYMBOL][A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][X][Y][Z]U format code (date() function) UCASE() function ucwords() function 2nd ulimit commandoperating systemsscalability uncompressingsource code (Apache installations) underline() function underscore (_) unitialized variables UNIXApacheinstalling (source) starting apachectl tool installing Apache 2nd Unixinstalling MySQL on 2nd 3rd 4th installing PHP on, with Apache 2nd 3rd 4th 5th integrating PHP with Apache on 2nd 3rd logresolve utilityhostnames;resolving UNIXOpenSSL libraryinstalling Unixrotatelogs programslogs (rotating) syslog daemonerrors;logging logging errors tail command-line utilityerror logs;monitoring Unix epoch UNIX TIMESTAMP() function unlink() functionfile deletion unsigned data types unsubscribe requests 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th unzipper UPDATE command 2nd 3rd 4th 5th 6th 7th 8th 9th UPDATE statement 2nd upgradesApache 2nd 3rd modifying without upgrading 2nd Apache News and Announcements list MySQL 2nd MySQL Announcements list PHP 2nd when to upgrade 2nd PHP Announcements list staying current 2nd when to upgrade 2nd 3rd 4th uptime status variable URLsdirectivesappplying USAGE command user inputcalendar example 2nd 3rd 4th HTML formsaccessing from multiple SELECT elements 2nd 3rd 4th 5th receiving 2nd 3rd 4th user login form 2nd 3rd 4th user managementdatabase file-based access control authentication 2nd functionsauthentication modules user mangementfile-based authentication user table User-Agent header user-created functions user-defined functions values, returning 2nd usernamesbasic authentication storinguser management;client authentication usersadding 2nd 3rd 4th 5th 6th 7th database file-based access control authentication 2nd deletingdatabase file-based access control authentication listsRequire directive managementclient authentication ownershipverifying redirecting (forms) 2nd root non root users running MySQL as, stopping root usersMySQL running as 2nd users filebackend storagefile-based authentication USR1signalssending utilitiesgzipApache source code;uncompressing htpasswduser password files;managing htpasswd.exeuser password files;managing logresolve utilityhostnames;resolving logresolve.exe utilityhostnames;resolving makeApache;building rotatelogs utilitylogging program tail command-lineerror logs;monitoring (Unix)