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复制一个目录到另外一个目录

sudo cp -avr /home/seamanj/Downloads/glm /usr/local

• -a : Preserve the specified attributes such as directory an file mode, ownership, timestamps, if possible additional attributes: context, links, xattr, all.
• -v : Explain what is being done.
• -r : Copy directories recursively.

显示日期的指令：date

显示日历的指令: cal

计算器:  bc

delete file:

sudo rm -vr /opt/tbb44_20151115oss

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