Good old trusty grep is used once again. We use grep to recursively, -r, look at all the files in the path_to_moodle. We tell grep to not print out the file names that patterns where found in with –no-filename and the -o option tells grep to output the exact pattern matched. The pattern itself is of the form: starts with “$CFG->” and is followed by one, or more lowercase characters. The pipe to sort -u sorts output and removes duplicate strings.

This command will produce something like the following list which I made using Moodle 1.9.2.

$CFG->admin
$CFG->adminblocks
$CFG->admineditalways
$CFG->adminseesall
$CFG->adminusehtmleditor
$CFG->ajaxcapable
$CFG->ajaxtestedbrowsers
$CFG->allowcategorythemes
$CFG->allowcoursethemes
$CFG->allowemailaddresses
$CFG->allowobjectembed
$CFG->allowthemechangeonurl
$CFG->allowunenrol
$CFG->allowuserblockhiding
$CFG->allowusermailcharset
$CFG->allowuserthemes
$CFG->allowvisiblecoursesinhiddencategories
$CFG->allusersaresitestudents
$CFG->alternateloginurl
$CFG->an
$CFG->apacheloguser
$CFG->apachemaxmem
$CFG->aspellextradicts
$CFG->aspellpath
$CFG->assignment
$CFG->attemptuniqueid
$CFG->auth
$CFG->autolang
$CFG->autologinguests
$CFG->backup
$CFG->block
$CFG->blocks
$CFG->blocksdrag
$CFG->blog
$CFG->bloglevel
$CFG->bounceratio
$CFG->cachetext
$CFG->cachetype
$CFG->calendar
$CFG->chat
$CFG->clamfailureonupload
$CFG->config
$CFG->cookiehttponly
$CFG->cookiesecure
$CFG->country
$CFG->coursemanager
$CFG->coursemanagers
$CFG->coursesperpage
$CFG->coursetheme
$CFG->creatornewroleid
$CFG->cronclionly
$CFG->cronremotepassword
$CFG->currenttextiscacheable
$CFG->customersupportemail
$CFG->customersupportemaildisplay
$CFG->customscripts
$CFG->data
$CFG->datadir
$CFG->dataroot
$CFG->dbfamily
$CFG->dbhost
$CFG->dblogerror
$CFG->dbname
$CFG->dbpass
$CFG->dbpersist
$CFG->dbsessions
$CFG->dbtype
$CFG->dbuser
$CFG->debug
$CFG->debugdisplay
$CFG->debugsmtp
$CFG->decsbureauid
$CFG->decsitemtypeid
$CFG->defaultallowedmodules
$CFG->defaultblocks
$CFG->defaultcourseroleid
$CFG->defaultfrontpageroleid
$CFG->defaultrequestcategory
$CFG->defaultuserroleid
$CFG->deleteunconfirmed
$CFG->denyemailaddresses
$CFG->detect
$CFG->digestmailtime
$CFG->digestmailtimelast
$CFG->directorypermissions
$CFG->dirroot
$CFG->disablebyteserving
$CFG->disablecourseajax
$CFG->disableglobalshack
$CFG->disablegradehistory
$CFG->disablemycourses
$CFG->disablescheduledbackups
$CFG->disablestatsprocessing
$CFG->disableupgradelogging
$CFG->disableuserimages
$CFG->displaydebug
$CFG->displayloginfailures
$CFG->docroot
$CFG->doctonewwindow
$CFG->eaccelerator
$CFG->editorbackgroundcolor
$CFG->editordictionary
$CFG->editorfontfamily
$CFG->editorfontlist
$CFG->editorfontsize
$CFG->editorformatlist
$CFG->editorhidebuttons
$CFG->editorkillword
$CFG->editorspelling
$CFG->editorsrc
$CFG->emailconnectionerrorsto
$CFG->emoticons
$CFG->enableajax
$CFG->enablecourserequests
$CFG->enableglobalsearch
$CFG->enableglobalshack
$CFG->enablegroupings
$CFG->enablehtmlpurifier
$CFG->enableoutcomes
$CFG->enablerecordcache
$CFG->enablerssfeeds
$CFG->enablestats
$CFG->enabletrusttext
$CFG->enrol
$CFG->errordocroot
$CFG->exercise
$CFG->extendedusernamechars
$CFG->extratabs
$CFG->filelifetime
$CFG->filter
$CFG->filterall
$CFG->filtermatchoneperpage
$CFG->filtermatchonepertext
$CFG->filteruploadedfiles
$CFG->footer
$CFG->footerlinks
$CFG->forcefirstname
$CFG->forcelastname
$CFG->forcelogin
$CFG->forceloginforprofiles
$CFG->forcetimezone
$CFG->forgottenpasswordurl
$CFG->formatstring
$CFG->formatstringstriptags
$CFG->forum
$CFG->framename
$CFG->frametarget
$CFG->frontpage
$CFG->frontpageloggedin
$CFG->fullnamedisplay
$CFG->gdversion
$CFG->geoipfile
$CFG->glossary
$CFG->googlemapkey
$CFG->grade
$CFG->gradebookroles
$CFG->gradeexport
$CFG->gradehistorylifetime
$CFG->gradepublishing
$CFG->guestloginbutton
$CFG->guestroleid
$CFG->handlebounces
$CFG->header
$CFG->hiddenuserfields
$CFG->hideactivitytypenavlink
$CFG->hivecbid
$CFG->hivehost
$CFG->hivepassword
$CFG->hivepath
$CFG->hiveport
$CFG->hiveprotocol
$CFG->hiveusername
$CFG->hotpot
$CFG->hotpotismobile
$CFG->hotpotroot
$CFG->hotpottemplate
$CFG->htmleditor
$CFG->httpsthemewww
$CFG->httpswwwroot
$CFG->ignoresesskey
$CFG->intcachemax
$CFG->iplookup
$CFG->javascript
$CFG->journal
$CFG->keeptagnamecase
$CFG->lams
$CFG->lang
$CFG->langcache
$CFG->langlist
$CFG->langmenu
$CFG->lastexpirynotify
$CFG->lastnotifyfailure
$CFG->latinexcelexport
$CFG->ldap
$CFG->libdir
$CFG->local
$CFG->locale
$CFG->loginaspassword
$CFG->loginhttps
$CFG->loglifetime
$CFG->logsql
$CFG->longtimenosee
$CFG->maildomain
$CFG->mailnewline
$CFG->mailprefix
$CFG->max
$CFG->maxbytes
$CFG->maxeditingtime
$CFG->memcachedhosts
$CFG->memcachedpconn
$CFG->message
$CFG->messagewasjustemailed
$CFG->messaging
$CFG->migrated
$CFG->minbounces
$CFG->minpassworddigits
$CFG->minpasswordlength
$CFG->minpasswordlower
$CFG->minpasswordnonalphanum
$CFG->minpasswordupper
$CFG->mnet
$CFG->moddata
$CFG->modpixpath
$CFG->my
$CFG->mymoodleredirect
$CFG->noconvertjournals
$CFG->nodefaultuserrolelists
$CFG->noemailever
$CFG->nofixday
$CFG->nolastloggedin
$CFG->nonmetacoursesyncroleids
$CFG->noreplyaddress
$CFG->notifyloginfailures
$CFG->notifyloginthreshold
$CFG->notloggedinroleid
$CFG->old
$CFG->opentogoogle
$CFG->os
$CFG->ostype
$CFG->pagepath
$CFG->pagetheme
$CFG->passwordpolicy
$CFG->passwordsaltmain
$CFG->pathtoclam
$CFG->pathtodu
$CFG->perfdebug
$CFG->pixpath
$CFG->preferlinegraphs
$CFG->prefix
$CFG->preventaccesstohiddenfiles
$CFG->protectusernames
$CFG->proxyhost
$CFG->proxypassword
$CFG->proxyport
$CFG->proxytype
$CFG->proxyuser
$CFG->qtype
$CFG->quarantinedir
$CFG->quiz
$CFG->rcache
$CFG->rcachettl
$CFG->recaptchaprivatekey
$CFG->recaptchapublickey
$CFG->registerauth
$CFG->registered
$CFG->release
$CFG->repository
$CFG->repositoryactivate
$CFG->repositorywebroot
$CFG->resource
$CFG->resourcetrimlength
$CFG->respectsessionsettings
$CFG->restrictbydefault
$CFG->restrictmodulesfor
$CFG->rolesactive
$CFG->runclamonupload
$CFG->running
$CFG->scorm
$CFG->search
$CFG->session
$CFG->sessioncookie
$CFG->sessioncookiepath
$CFG->sessiontimeout
$CFG->showblocksonmodpages
$CFG->showcrondebugging
$CFG->showcronsql
$CFG->siteblocksadded
$CFG->siteidentifier
$CFG->sitemailcharset
$CFG->sitepolicy
$CFG->slasharguments
$CFG->smartpix
$CFG->smtphosts
$CFG->smtpmaxbulk
$CFG->smtppass
$CFG->smtpuser
$CFG->sso
$CFG->statscatdepth
$CFG->statsfirstrun
$CFG->statsmaxruntime
$CFG->statsrolesupgraded
$CFG->statsruntimestarthour
$CFG->statsruntimestartminute
$CFG->statsuserthreshold
$CFG->stringfilters
$CFG->stylesheets
$CFG->supportemail
$CFG->supportname
$CFG->supportpage
$CFG->tagsort
$CFG->template
$CFG->textfilters
$CFG->textfilterx
$CFG->theme
$CFG->themedir
$CFG->themelist
$CFG->themeorder
$CFG->themewww
$CFG->timezone
$CFG->tracksessionip
$CFG->type
$CFG->unicodecleanfilename
$CFG->unicodedb
$CFG->unzip
$CFG->upgrade
$CFG->usepaypalsandbox
$CFG->usesid
$CFG->usetags
$CFG->version
$CFG->wiki
$CFG->wordlist
$CFG->workshop
$CFG->wwwdir
$CFG->wwwroot
$CFG->xml
$CFG->xmldbdisablecommentchecking
$CFG->xmldbdisablenextprevchecking
$CFG->xmldbreconstructprevnext
$CFG->xmlstrictheaders
$CFG->zip