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  • Chap2:什么是shell[The Linux Command Line]

    1 shell - a program that takes keyboard commands and passes them to the operating system to carry out

    2 bash - an acronym for 'Bourne Again SHell,is an enhanced replacement for sh, the original Unix shell program written by Steve Bourne.

    3 Terminal -use the program ,we can interact with the shell

    4 shell prompt-include your username@machinename ,followed by the current working directory and a dollar sign.

             -if the last character of the prompt is pound sign('#') , the terminal session has superuser  privileges. this means either we are logged in as the root user or we selected emulator that  provides superuser(administrative) privileges.

    5 command history - Press the down-arrow key and the previous command disappears.

    6 copy-If you highlight some text by holding down the left mouse button and dragging the mouse over it (or double clicking on a word), it is copied into a buffer maintained by X. Pressing the middle mouse button will cause the text to be pasted at the cursor location.

    7 a few simple commands

              (1)date-displays a calendar of the current time and date 

         (2)cal-displays a calendar of the current month

              (3)df- to see the current amount of free space on your disk drives

              (4)free-to display the amount of free memory

              (5)exit-clost the terminal emulator window

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  • 原文地址:https://www.cnblogs.com/ERFishing/p/10053865.html
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