PyMOL>load dat/pept.pdb
 CmdLoad: "dat/pept.pdb" loaded as "pept".
PyMOL>select (resi trp)
 Selector: selection "sel01" defined with 0 atoms.
PyMOL>indicate (name ca)
PyMOL>deselect
PyMOL>select 1/o
 Selector: selection "sel02" defined with 1 atoms.
PyMOL>select 1/o+ca+n
 Selector: selection "sel03" defined with 3 atoms.
PyMOL>select /pept
 Selector: selection "sel04" defined with 107 atoms.
PyMOL>select bb = (name ca or name c or name n)
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = (name ca,c,n)
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = */ca+c+n
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = (*/ca,c,n)
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = (not (not (name ca or name c or name n)))
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = (not (not (n. c|n. ca|n. n)))
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = (not (not (not (not (not (not (not (not (not (not (not (not (not (not (*/ca,c,n)))))))))))))))
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = (all and all and all and (not (not all)) and (not none) and all and not (not (n;ca,c,n)))
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb,(name ca or (n;c | (n. n) | (*/n)))
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb, \
PyMOL>name ca \
PyMOL>or name c \
PyMOL>or name n
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = bb
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select bb = not not bb
 Selector: selection "bb" defined with 39 atoms.
PyMOL>select cc = not bb
 Selector: selection "cc" defined with 68 atoms.
PyMOL>select bb = not cc
 Selector: selection "bb" defined with 39 atoms.
PyMOL>enable
PyMOL>enable bb
PyMOL>enable cc
PyMOL>disable cc
PyMOL>hide lines,cc
PyMOL>hide lines,bb
PyMOL>show (bb)
PyMOL>set ray_default_renderer=2
 Setting: ray_default_renderer set to 2.
PyMOL>ray
 RayRenderTest: obtained 63 graphics primitives.
PyMOL>dele all
PyMOL>load dat/1tii.pdb
HEADER    ENTEROTOXIN                             20-MAR-96   1TII
TITLE     ESCHERICHIA COLI HEAT LABILE ENTEROTOXIN TYPE IIB
COMPND    MOL_ID: 1;
COMPND   2 MOLECULE: HEAT LABILE ENTEROTOXIN TYPE IIB;
COMPND   3 CHAIN: D, E, F, G, H, A, C;
COMPND   4 SYNONYM: LT-IIB;
COMPND   5 ENGINEERED: YES;
COMPND   6 OTHER_DETAILS: LATENT/INACTIVE FORM
 ObjectMolecule: Read secondary structure assignments.
 ObjectMolecule: Read crystal symmetry information.
 Symmetry: Found 6 symmetry operators.
 CmdLoad: "dat/1tii.pdb" loaded as "1tii".
PyMOL>count_atoms 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+55+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70+71+72+73+74+75+76+77+78+79+80+81+82+83+84+85+86+87+88+89+90+91+92+93+94+95+96+97+98+99+100+101+102+103+104+105+106+107+108+109+110+111+112+113+114+115+116+117+118+119+120+121+122+123+124+125+126+127+128+129+130+131+132+133+134+135+136+137+138+139+140+141+142+143+144+145+146+147+148+149+150+151+152+153+154+155+156+157+158+159+160+161+162+163+164+165+166+167+168+169+170+171+172+173+174+175+176+177+178+179+180+181+182+183+184+185+186+187+195+196+197+198+199+200+201+202+203+204+205+206+207+208+209+210+211+212+213+214+215+216+217+218+219+220+221+222+223+224+225+226+227+228+229+230/
 count_atoms: 5655 atoms
PyMOL>print cmd.count_atoms("resi 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+55+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70+71+72+73+74+75+76+77+78+79+80+81+82+83+84+85+86+87+88+89+90+91+92+93+94+95+96+97+98+99+100+101+102+103+104+105+106+107+108+109+110+111+112+113+114+115+116+117+118+119+120+121+122+123+124+125+126+127+128+129+130+131+132+133+134+135+136+137+138+139+140+141+142+143+144+145+146+147+148+149+150+151+152+153+154+155+156+157+158+159+160+161+162+163+164+165+166+167+168+169+170+171+172+173+174+175+176+177+178+179+180+181+182+183+184+185+186+187+195+196+197+198+199+200+201+202+203+204+205+206+207+208+209+210+211+212+213+214+215+216+217+218+219+220+221+222+223+224+225+226+227+228+229+230")
5655
PyMOL>dele all
PyMOL>load dat/pept.pdb
 CmdLoad: "dat/pept.pdb" loaded as "pept".
PyMOL>load dat/tiny.pdb, model
 Executive-Warning: name "model" collides with a selection language keyword.
 CmdLoad: "dat/tiny.pdb" loaded as "model".
PyMOL>load dat/small01.mol, test+me
 ExecutiveLoad: "dat/small01.mol" loaded as "test+me", through state 1.
PyMOL>load dat/small02.pdb, mymodel
 CmdLoad: "dat/small02.pdb" loaded as "mymodel".
PyMOL>load dat/small03.mol2, model2
 ObjectMoleculeReadStr: read through molecule 1.
 ObjectMoleculeReadStr: read through molecule 2.
 ObjectMoleculeReadStr: read through molecule 3.
 ObjectMoleculeReadStr: read through molecule 4.
 ObjectMoleculeReadStr: read through molecule 5.
 ObjectMoleculeReadStr: read through molecule 6.
 ObjectMoleculeReadStr: read through molecule 7.
 ObjectMoleculeReadStr: read through molecule 8.
 ObjectMoleculeReadStr: read through molecule 9.
 ObjectMoleculeReadStr: read through molecule 10.
 ExecutiveLoad: "dat/small03.mol2" loaded as "model2", through state 16.
PyMOL>count_atoms model
Selector-Error: Misplaced ).
Selector-Error: Malformed selection.
( model )<--
 count_atoms: -1 atoms
PyMOL>count_atoms model model
 count_atoms: 37 atoms
PyMOL>count_atoms /model
 count_atoms: 37 atoms
PyMOL>count_atoms pept
 count_atoms: 107 atoms
PyMOL>count_atoms model model pept
 count_atoms: 144 atoms
PyMOL>count_atoms /model+pept
 count_atoms: 144 atoms
PyMOL>count_atoms /pept+model
 count_atoms: 144 atoms
PyMOL>count_atoms /test+\me
 count_atoms: 36 atoms
PyMOL>count_atoms /pept+model+test\+me
 count_atoms: 180 atoms
PyMOL>count_atoms test+me
 count_atoms: 36 atoms
PyMOL>count_atoms test+me model model
 count_atoms: 73 atoms
PyMOL>count_atoms mymodel
 count_atoms: 36 atoms
PyMOL>count_atoms model2
 count_atoms: 389 atoms