How Do I Unix
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A quick introduction to the history of unix, where to find unix now, some common command line command and how to link commands together to solve problems.
How Do I Unix
- 1. HOW DO I UNIX ? DEREK GRAHAM
- 4. UNIX PROJECT GOALS performance reliability multi-user security admin abilities ordinary user abilities portable
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- 12. SO FROM NOW ON LINUX == UNIX
- 13. SO WHAT ACTUALLY IS AN OPERATING SYSTEM? AN OPERATING SYSTEM IS
- 14. SO WHAT ACTUALLY IS AN OPERATING SYSTEM? AN OPERATING SYSTEM IS the invisible software that tells the hardware what to do understands keyboard and mouse draws on the screen reads and writes to disk reads and write to network decides which program runs when decides how programs work together
- 15. SO WHAT ACTUALLY IS AN OPERATING SYSTEM? IT ISNT anything you can see anything you can touch a command line the windows on your screen
- 16. QUIZ TIME WHICH THINGS ARE UNIX?
- 42. WHERE IS UNIX MAJORITY OF WEB SERVERS Amazon Flickr Paypal Wikipedia Facebook Youtube
- 44. DISTROS DESKTOP AND LAPTOP UNIX Ubuntu Fedora Debian (& Raspbian) Mint Elementary BSD
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- 50. GETTING THINGS DONE GUIS ARE ALL THE SAME Web browser Email All the normal applications Personal preference
- 51. GETTING THINGS DONE WHERE UNIX SHINES command line tools shell scripting compose simple programs together to make complicated ones
- 52. GETTING THINGS DONE COMMAND LINE PHILOSOPHY A program should do one thing and do it well A programs output will be the input to another program A program should use text streams for input and output Text is the universal interface Dont clutter output with extra information
- 53. GETTING THINGS DONE GOTCHAS case is important windows paths use unix paths use / why do web addresses use / ? commands can be dif鍖cult to remember arguments can be worse!
- 55. GETTING THINGS DONE MOVING AROUND where am i ? - pwd change directory - cd whats in this directory ? ls
- 56. GETTING THINGS DONE FILES print a 鍖le to screen - cat <鍖lename> copy 鍖le - cp <from> <to> move 鍖le - mv <from> <to> 鍖nd a 鍖le - 鍖nd . -name *.txt search inside 鍖les - grep hello *.txt manipulate text - sed
- 57. GETTING THINGS DONE DIRECTORIES create a directory - mkdir <directory> delete empty directory - rmdir <directory> permanently delete !!! - rm <鍖le or directory> there is no recycle bin !!!
- 58. GETTING THINGS DONE DOWNLOAD A FILE wget http://mywebsite.com/mypicture.jpg
- 59. GETTING THINGS DONE REDIRECTING WITH < > AND I chain simple utilities together in interesting ways stdin is the command line stdout is the screen ls . stdin is . stdout is the screen ls . > list.txt stdout is now a 鍖le ls -l | grep hello stdout goes to input of grep very fast - unix handles plumbing between programs
- 60. GETTING THINGS DONE SEARCH FOR FILES ls lists 鍖les grep searches text and prints results sort orders the results ls -l | grep hello | sort -r
- 61. GETTING THINGS DONE HOW MANY TIMES DOES A WORD APPEAR IN A FILE? wget https://www.gutenberg.org/鍖les/102/102-0.txt cat 102-0.txt | grep -c Wilson
- 62. GETTING THINGS DONE WHAT IS THE MOST POPULAR WORD IN A BOOK? cat 102-0.txt | (type out the content of the 鍖le ) tr -cs A-Za-z 'n' | (put each word on a new line) tr A-Z a-z | (convert everything to lower case) sort | (sort alphabetically) uniq -c | (remove duplicates but count how many there were) sort -rn (sort in descending order) head -n 1 (take the 鍖rst item from the list)
- 64. GETTING THINGS DONE SECURITY AND SUDO Files are not executable by default Unix has a lot of power if you need it Users do not have super powers You need to be an admin to use super powers Super User DO
- 65. GETTING THINGS DONE HELP !!!!! Man pages are your friend ! man ls man pwd q to quit
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