Possible values for \fontseries and \fontshape

Question

What are the possible values for \fontseries and \fontshape? I'm aware of

\fontseries{m}
\fontseries{bx}

\fontshape{n}
\fontshape{it}

But I'm sure there're more of them.

Answer 1

Series, where any combination of weight and width is [in theory] possible:

weight                    width
Ultra Light       ul      Ultra Condensed     uc    
Extra Light       el      Extra Condensed     ec    
Light             l       Condensed            c      
Semi Light        sl      Semi Condensed      sc    
Medium (normal)   m
Semi Bold         sb      Semi Expanded       sx    
Bold              b       Expanded             x 
Extra Bold        eb      Extra Expanded      ex 
Ultra Bold        ub      Ultra Expanded      ux

Shape:

upright (normal)   n 
italic             it
slanted/oblique    sl 
small caps         sc
upright italic     ui
outline            ol 

It depends to the definition of the font, if there are less or more ... For the current TL 2012 we get the following values for the series:

b,bc,bm,bux,bx,c,cl,d,db,dbuc,eb,ebc,ebx,el,f,g,i,l,lc,lux,lx,m,mb,mc,muc,mx,n,nx,
ny,o,s,sb,sbc,sbx,sl,ub,ubc,ubx,ux,w,x,xl,z

and for the shape:

a,ac,b,bc,bl,bx,cal,crml,ds,fic,fr,fsc,g,gi,gu,i,ic,Iit,in,In,Isc,Isl,it,itsc,iv,jm,Jm,
kfn,l,li,n,na,ns,o,oi,oj,ol,os,out,p,r,ro,rs,s,sc,scit,sco,scsl,scui,sf,si,sk,sl,slsc,
so,sr,st,ta,tabnums,textdenomnums,textnumnums,tt,u,ui,uv,w

See comment below where Heiko lists some fonts which refer to the given values.

Answer 2

The standard manual for such questions are fntguide LaTeX2ε font selection

Here you can find the following hint:

The most common values for the font series are:

m             Medium
b             Bold
bx            Bold extended
sb            Semi-bold
c             Condensed

The most common values for the font shape are:

n              Normal (that is ‘upright’ or ‘roman’)
it             Italic 
sl             Slanted (or ‘oblique’)
sc             Caps and small caps

You can select what you want as long as the font file exist.