16.8. 20 Useful Unix Utilities

. 20 Useful Unix Utilities So far, you've read about only a handful of the hundreds of Unix programs that are built into Mac OS X and ready to run. Yes, ls and sudo are very useful tools, but they're only the beginning. As you peruse beginner-level Unix books and Web sites | . 20 Useful Unix Utilities So far you ve read about only a handful of the hundreds of Unix programs that are built into Mac OS X and ready to run. Yes Is and sudo are very useful tools but they re only the beginning. As you peruse beginner-level Unix books and Web sites see Appendix E for example you ll gradually become familiar with a few more important terms and tools. Here s a rundown of some more cool and very safe programs that await your experimentation. Tip If you don t return to the prompt after using one of these commands type q or in some cases quit and then hit Enter. . 20 Useful Unix Utilities . bc Mac OS X and Windows aren t the only operating systems that come with a basic calculator accessory Unix is well equipped in this regard too. When you type bc and hit Enter you get a copyright notice and then. .nothing. Just type the equation you want to solve such as 2 2 or 95 97 456 2-65 or 2 3 16595 and then press Enter. On the next line bc instantly displays the result of your calculation. In computer land designates multiplication and represents division. Note too that bc solves equations correctly it calculates multiplication and division before addition and subtraction and inner parentheses before the outer ones. For more bc tricks and tips type man bc at the prompt. . kill Mac OS X offers no shortage of ways to cut the cord on a program that seems to be locked up or runnning amok. You can force quit it use Activity Monitor or use kill. The kill program in Terminal simply force quits a program as though by remote control. It even works when you SSH into your Mac from a remote location as described in Chapter 22. All you have to do is follow the kill command with the ID number of the program you want to terminate. And how do you know its ID number You start by running top described in a moment whose first column shows the PID process ID of every running program. Tip Unless you also use sudo you can kill only programs .

Không thể tạo bản xem trước, hãy bấm tải xuống
TÀI LIỆU XEM NHIỀU
TÀI LIỆU MỚI ĐĂNG
10    66    2    29-03-2024
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.