1. unix: 1s,cd.
2. unix: cp,mv,rm. .
3. unix: cd,mkdir,rmdir. .
4. windows: dir,cd. .
5. windows: copy,del,move. .
6. windows: cd,mkdir,move. .
7. unix: cat,more,less. .
8. / . .
9. . .
10. unix: head,tail. .
11. unix: sort,grep. .
12. unix: who,ps. .
13. shell unix-. .
14. shell unix-. .
15. (char,int).
16. (float,double). .
17. signed unsigned .
18. short long .
19. . .
20. . . .
21. , . (, , ) . ( #define).
22. , . .
23. . .
24. .
25. .
26. . .
27. . (goto)
(if else) , - .
28. - (switch case). break. - .
29. (while) (do while) . - .
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30. for . while.
31. break continue . .
32. . ( ), . .
33. . .
34. .
35. . .
36. . , . .
37. . main.
38. / ( printf scanf) stdio .
39. , (, , , .) stdio .
40. , string,stdio,stlib .
