Command Line Awesome, WordCamp Grand Rapids 2014

Hi, my name is TopherI’m a WordPress developer

from Grand Rapids MI

@topher1kenobe

Command Line AwesomeTopher DeRosia

@topher1kenobe

Command Line

AWESOME


@topher1kenobe

Learning the command line.

1. Concepts2. Basic commands3. Available Programs4. A little fun


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The Shell

When you open the terminal, you’re in a shell. Bash is the most common shell.

Others are Bourne, csh, zsh, kshCommand Line Awesome

Topher DeRosia@topher1kenobe

Your History

Every command you type is saved in a file called .bash_history


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Your History

Arrow up to see past commands. Ctrl-r and start typing to search your history.


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Moving Around

Ctrl-a takes you to the beginning of the line. Ctrl-e to the end.


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Other Keybindings

Bash uses the same keybindings as the emacs editor.

http://wttools.sourceforge.net/emacs-stuff/emacs-keybindings.html


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Documentation

“man” pages contain docs for commands. Ex: man cd


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Flags

Most commands accept modifiers called ‘flags’ like this:

ls -al


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Change Directories

cdcd path/cd ~/path/cd -Check out the man page.


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Where am I?

pwd == Present Working Directory

Man oh man.


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Make Directories

mkdir mycooldir

Check out the man page, -p is cool.


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List Files

lsls -alls -latr

LOTS of good stuff in the man page.


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Change Files

mv oldfile newfilecp (-R) oldfile newfilerm (-R) file-or-dir

Have I mentioned man pages?


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Examine Files

morelesscat

man man man man man...


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Edit Filesnano

VIMemacsjoe

Google knows Al ( ⅔ of All )


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Search Files

grep (-ir) keyword *ack keyword --php

/ lets you search inside man pages


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SSH

Encrypted connection to a remote shell

ssh [email protected] (-r) files [email protected]:~/path/

Oh look, there’s a man page.


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mailto:[email protected]

mailto:[email protected]

wget

Makes one http call and returns the result

wget http://derosia.com/parchment.jpg

Man, I wish there were docs.


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Network Programs

whoishosttracerouteping

Nothing clever, read the man pages.


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Heads and TailsTail shows the last 10 lines of a file.

Head shows the first 10 lines of a file.

Guess how to change the number. (man)


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Tail -f

-f updates the results as the file changes.

Use this to watch log files.

Ctrl-c quits.


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top

Shows processes, resource use, etc.

Homework: read about ‘load average’


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mysqlmysql -u username -p database

Puts you on a mysql command line, lets you run SQL queries.

$ man mysqlNo manual entry for mysql


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Fun stuffcal - shows a calendardate - Shows… the datebc - basic calculator (basic)sl - like ls, but… not

Man, the places you’ll go


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Voodooperl -pi -e ‘s#search#replace#g’ *

mysql -u user -p database < db_export.sql

tail -f ~/logs/error_log | grep -i exe

cat file | wc -l(counts lines)


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Homeworkchmodchownlocatekill

Google is your friend here.


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WP CLIhttp://wp-cli.org/

Interact with the WP admin UI from the command line

wp --help


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Resourceshttp://www.commandlinefu.com

http://www.commandlinefu.com/commands/by/topher1kenobe

http://cli.learncodethehardway.org/bash_cheat_sheet.pdf


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http://www.commandlinefu.com/



THANKS FOR

LISTENING


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http://derosia.com/Follow me @topher1kenobe

Internet

Command Line Awesome, WordCamp Grand Rapids 2014