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-a logical comparison operators
a2p filters
AbiWord word processing program (GNOME Office)
ac command
access
     Apache Server file systems, controlling 2nd
     file permissions, changing via chmod shell command
access control directives (ftpaccess configuration file), Wu-FTPd server configuration
     blocking host's server access
     defining user classes
     limiting
         anonymous user access
         number of invalid password entries
         permissions based on individual ID
     restricting
         number of users in classes
         permissions based on Group IDs
access points, wireless network security
ACID (Atomicity Consistency Isolation Durability), database compliance comparisons
ACL (access control lists), Squid proxy server
ACPI (Advanced Configuration and Power Interface), Ubuntu power management
actions (PHP loops)
add-on postfixes
add-on prefixes
Add/Remove Applications, software management
address-based virtual hosts
administrator privileges, accessing
ADSL modems
adsl-stop command
afio backup software
alias command
aliases, myenv shell script
allow directive (Apache Server)
AllowOverrides configuration directive (Apache Server)
ALSA (Advanced Linux Sound Architecture) sound card drivers
alsamixer command 2nd
Amanda backup application
amdump command
American Registry for Internet Numbers website
ampersand (&)
     && (double ampersand) number comparison operators
     shell background processing
AMTP
AND statements (SQL)
anon mkdir write enable setting (vstfpd server anonymous access control)
anon other write enable setting (vstfpd server anonymous access control)
anon upload enable setting (vstfpd server anonymous access control)
anon world readable only setting (vstfpd server anonymous access control)
anonymous access control (vsftpd server)
anonymous enable setting (vstfpd server anonymous access control)
anonymous FTP servers
     authenticated servers versus
     configuring
AOL (America Online)
Apache Group website
Apache Server
     development of
     documentation websites
     downloading
     dynamic content 2nd
     file systems
         access control 2nd
         authentication
     installing
         file locations
         from APT
     Internet security
     logging
     mod_access module
     mod_alias module
     mod_asis module
     mod_auth module
     mod_auth_anon module
     mod_auth_dbm module
     mod_auth_digest module
     mod_autoindex module
     mod_cgi module
     mod_dir module
     mod_env module
     mod_expires module
     mod_headers module
     mod_include module
     mod_info module
     mod_log_config module
     mod_mime module
     mod_mime_magic module
     mod_negotiation module
     mod_proxy module
     mod_rewrite module
     mod_setenvif module
     mod_sll module
     mod_speling module
     mod_status module
     mod_unique_id module
     mod_userdir module
     mod_usertrack module
     mod_vhost_alias module
     optimizing
     quick start guide
     runtime configuration
         configuration directives
         httpd.conf configuration file
         MPM
     security report websites
     source code, building
     starting/stopping
     upgrading, file locations
     usage statistics
     version information
     virtual hosting
Apache Software Foundation
apachectl command
append operators
application development (Ubuntu deployment plans)
Applications menu, Add/Remove Applications
apropos command 2nd
APT (Advanced Package Tool)
     Apache Server installations
     Aptitude
     configuring
     deb file storage
     dpkg command
     software management
         day-to-day usage
         finding software
apt-cache search tool
apt-get command 2nd
apt-get dist-upgrade command
apt-get remove command
apt-get-install command
apt-get-update command
Aptitude
ar (GNU archive development tool)
arch directory (/usr/src/linux-2.6 directory)
ark backup tool
ark command
array functions (PHP)
arrays 2nd
arsort() array function
as (GNU assembler)
ascii command, FTP text-based client interface
asort() array function
assigning
     FTP user permissions
     values to
         shell script variables
         strings in Python
asterisk (*)
     Python
     shell pattern-matching searches
     wildcards
at command, scheduling tasks
ATAPI (AT Attachment Packet Interface)
ATI graphics cards
atime (files), disabling
atq command, viewing batch job numbers
atrm command, deleting batch jobs
attached printers [See local printers.]
audio
     music players
     Real Player website
     streaming
authenticated FTP servers
authentication
     Apache Server file systems
     PAM
AuthGroupFile directive (Apache Server)
AuthName directive (Apache Server)
AuthType directive (Apache Server)
AuthUserFile directive (Apache Server)
autoconf (GNU configuration script generator)
autoconf utility (C/C++ programming)
autohacking
automating tasks
     scheduling tasks
         at command
         batch command
         cron daemon
     shell scripts
         #! (shebang lines)
         built-in variables 2nd
         built-in variables, viewing
         commands as
         environment variables
         executing
         positional parameters
         reasons for using
         special characters, list of
         storing for systemwide access
         testing
         trojan scripts
         user variables
         variables
         writing
     shells
         backslashes (/) as escape characters
         backticks (`), replacing strings with output
         changing
         command line 2nd
         Fedora Core shells list
         job-control commands
         maintaining shell strings with unexpanded variables
         man pages
         resolving variables in strings with embedded spaces
     system services
         bootup operation
         changing runlevels
         controlling at boot
         manually starting/stopping
         troubleshooting runlevels
autoresponders (email)
.avi video file format
Ax, shell pattern-matching searches