1 Get Started

Outline • Working with the shell Get Started – Basic file operations – Editing command lines – System info/settings

IT244 - Introduction to Linux / Unix – Help and documents Instructor: Bo Sheng

Everything is case sensitive

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Basic File Operations Basic File Operations • List files ( ls ) • Change directory ( cd ) – ls – cd / – pwd (print working directory) – ls – ls / – pwd – ls /home (see your username?) – cd /home/your username/it244 – ls /home/shengbo/it244 – ls – pwd

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Basic File Operations Basic File Operations • Read files ( cat ) • Write/create files ( echo ) – cat /home/shengbo/it244/welcome – ls – cat /var/run/motd.dynamic – echo “hello world” > hello – Some files are not readable (e.g., binary) – ls • cat /bin/cat – cat hello – echo “I am your name” >> hello – cat hello – cat hello hello

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1 Basic File Operations Editing Command Lines • Execute files • Delete a char – /home/shengbo/it244/exetest – “backspace” and “delete” – Abort execution • Delete a word ( CTRL+W ) • CTRL+C • Delete a line ( CTRL+U ) • CTRL+Z and kill – /home/shengbo/it244/exetest – CTRL+Z – jobs • Arrow keys – kill %1 – Up / down: browse the command history – jobs – Left / right: move the cursor

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System info/settings Practice

– ls • Which shell we are using? – pwd – ps – ls / – ls /home • What OS is running? – uname – cd / • Something you can’t do (su/sudo) – ls – pwd – Try to create a file under / – cd /home/your username/it244 – pwd

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Practice Help and Documents

– echo “hello world” > hello – ls • --help option – cat hello • System manuals ( man ) – echo “I am your name” >> hello – cat hello – man ls – cat hello hello – man cat – man ssh – /home/shengbo/it244/exetest – man man – Press ctrl+c – /home/shengbo/it244/exetest – CTRL+Z – jobs – kill %1 – jobs

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2 Help and Documents • --help option • System manuals ( man ) – man ls – man cat – man ssh – man man • Reading long manuals – Press ENTER, SPACE, and Q

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Help and Documents Summary • GNU info / pinfo (menu display) • File operations – info ls – ls, pwd, cd, cat, echo – info cat – CTRL+C, CTRL+Z, kill, jobs – info info – Control+h • System info ps, uname • Search Keyword – – man –k – apropos • Help and documents – man, info, apropos, whatis – whatis

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Questions • Use man and info to read the manual of ls and find out how to distinguish files from directories.

• uname can display a lot more system information. Find a way to display the OS “kernel name” and “kernel release”.