In the .orc file we have :

instr 101 ;SIMPLE OSCIL
a1 oscil 10000, 440, 1
out a1
endin


the function number, which is the third argument of oscil is 1.

Is this function number is referring to the f-table in the .sco file ?

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OK, after reading the comments, let's recapitulate :

The function number, the third argument of oscil, is referring to the f-table in the .sco file. ftables can also be defined in ORC code via the ftgen opcode.

through cmd, it is possible to compile csound files :

cd [directory]
> csound filename.orc filename.sco


The .csd is unified file (.orc+.sco) with tags.

• [CsoundSynthesizer]
• [CsOptions]
  Options here
  [/CsOptions]
• [CsInstruments]
  The .orc file
  [/CsInstruments]
• [CsScore]
  The .sco file
  [/CsScore]