F

fcheck
fclose
feof
fflush
fgetline
fgetword
file
fileBrowserDialog
fileDialog
fileExtension 
fileInfo
filetest
filletCurve
filter
filterCurve
filterExpand
filterStudioImport
findAllIntersections 
findAnimCurves 
finder
findKeyframe
findMenuItem 
findRelatedSkinCluster 
firstParentOf 
fitBspline
flexor
floatEq 
floatField
floatFieldGrp
floatScrollBar
floatSlider
floatSlider2
floatSliderButtonGrp
floatSliderGrp
floor
flow
fluidCacheInfo
fluidEmitter
fluidVoxelInfo
flushUndo
fmod
fontDialog
fopen
format
formLayout
fprint
frameBufferName
frameLayout
fread
freeFormFillet
frewind
fromNativePath 
fwrite

indicates a MEL script