The composition and function of a computer
1 hardware system:
Central processing Unit (CPU): ① (for arithmetic and logic operations of data) ② Controller (responsible for coordinating the various components of the dispatch and command computer)
Memory: ① external memory (Hard disc U-disk) ② internal memory (includes read-only memory ROM and read-write memory RAM)
Input device (keyboard mouse scanner)
Output device (monitor audio projector printer)
2 software system;
System software (refers to systems that control and coordinate computers and external devices to support application development and operation)
(A collection of programming languages that users can use, as well as applications compiled in a variety of programming languages)
Two Linux
1 famous Linux distributions
Redhatenterprise Linux 2/3/4/5/6/7 |
Published by Red Hat Corporation |
Linux 12 |
Issued by Novell Corporation |
linux6.0 |
Released by the Debian maintenance community |
Ubuntu 12.10 |
Published and maintained by the Ubuntu community |
, for servers; Debian for desktop users , Ubuntu strictly cannot be counted as a standalone release, a Linux desktop system
2 linux
① Linux all Files small projects in ② specialty ③ combine multiple programs to perform complex tasks ④ User interface ⑤ Save the configuration file as a text document
3 commands commonly used on Linux use the format
Command (commands) "Options" "Parameters"
①ifconfig Viewing network card information
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②date
Formatted output
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Date before the output
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time before or after 5 seconds of output
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Normal format Conversion
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time walk after format conversion
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Output the time of next month or last month
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④echo
Output a string
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Output to a file
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The composition of the computer and the Linux