QBIC , 33 bytes
≈instr(Z,;)<1|Z=Z+chr$(_r32,126|)
Explicação
≈instr( , )<1| WHILE InStr() can't find
; the input (cmd line string argument) as part of
Z the output (Z$, which is printed automatically on exit)
Z=Z+ add to the output
chr$( ) an ASCII character
_r32,126| with a random codepoint between 32 and 126 (incl)
Exemplo de execução:
Command line: hi
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