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CISC 5500
Introduction; basic bash commands
Zhou Ji, Computer and Information Science
Fordham University
Table of contents
- 1. Introduction
- 2. Bash
basic commands
- 3. I/O redirection
- 4. Scripting
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CISC 5500 Introduction; basic bash commands Zhou Ji, Computer and - - PowerPoint PPT Presentation
CISC 5500 Introduction; basic bash commands Zhou Ji, Computer and - - PowerPoint PPT Presentation
CISC 5500 Introduction; basic bash commands Zhou Ji, Computer and Information Science Fordham University Table of contents 1. Introduction 2. Bash basic commands 3. I/O redirection 4. Scripting 1 Introduction to the course Purpose
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Introduction to the course
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Purpose
broaden your practical skills as a data scientists, or simply as a computer user three topics: Bash, SQL, R
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Administrative plan
website https://storm.cis.fordham.edu/ji/cisc5500scripting/ email zji@fordham.edu lectures, homework, lab, exams
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Introduction to Bash
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What is Bash?
prerequisite knowledge: OS, files and directories Bash is a shell, probably the most popular one. Where to get Bash:
- personal computer, if it is Mac or any Linux
- account on any Linux system, e.g. erdos, storm
- Windows: install WSL
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Linux File System
how files are organized
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navigate through the file system
based on the idea of current working directory print working directory pwd change directory cd directory name
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absolute path vs relative path
examples
- /home/staff/ji/file1
- ji/file1
special directory names . (self) and .. (parent) cd .. cd ../staff/bob/./..
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Look inside ...
list the content of a directory ls directory name print the content of a file cat file name
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Make changes
copy cp [source] [destination] move / rename mv delete rm create a directory mkdir what about creating a file? ultimate command to learn more man
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I/O redirection
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Input and output of a program
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I/O redirections
special input/output
- standard input
- standard output
- standard error
- utput redirection >
appending output redirection >> input redirection < pipe | redirection of standard error
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Scripting
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What is scripting
What is a command
- 1. executable
- 2. built-in command of the shell
- 3. function
- 4. alias
What is scripting
- Scripting is to write multiple commands in a text file so we can run
them all at once automatically.
- Scripting and programming are basically the same thing.
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How to write a script
Using a text editor vi or else Other tricks
- searching path
- permissions
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Summary
- what is Bash
- basic Linux commands
- I/O redirection
2020.8.27 14
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Questions?
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vi
vi can be an intimidating topic. Knowing some basics is still necessary even at the very beginning.
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