ref: 487c2a6e18f22dbd8a43aa150db10b19529848eb dir: /examples/username.leg/
%{ #include <unistd.h> %} start = "username" { printf("%s", getlogin()); } | < . > { putchar(yytext[0]); } %% int main() { while (yyparse()); return 0; }