Add first cut of Linux install instructions

common/welcome.tw2

@@ -14,5 +14,5 @@ That being said, let's start with our first question!
 ---
 ## Which OS do you use?
 
+- [[Linux->Linux Introduction]]
 - [[Mac->Mac Introduction]]
-

linux/architecture.tw2

@@ -0,0 +1,44 @@
+::Linux architecture
+# Determine process architecture on Linux
+
+To determine your process architecture, paste
+in the following command into your terminal:
+
+```
+uname -m
+```
+
+Hit `Enter` after you’ve pasted in the command and examine the output.
+
+## `x86_64`
+
+If the output is `x86_64` then you’re on a 64-bit architecture.
+
+The file you’re looking for is `exercism-linux-64bit.tgz`.
+
+## `i686`
+
+If the output is `i686` then you’re on a 32-bit architecture.
+
+The file you’re looking for is `exercism-linux-32bit.tgz`.
+
+## `armv5l`, `armv6l`, `armv7l` or `armv8l`
+
+If the output is `armv5l`, `armv6l`, `armv7l`
+or `armv8l` then you’re on an ARM architecture.
+
+The file you’re looking for is `exercism-linux-arm-v5.tgz`,
+`exercism-linux-arm-v6.tgz`, `exercism-linux-arm-v7.tgz`
+or `exercism-linux-arm-v8.tgz` (respectively).
+
+## Other
+
+If your output doesn’t match any of the above, click on _I
+don’t know_ below and we could recommend steps to help you.
+
+---
+
+## Do you know your system’s process architecture?
+
+- [[Yes->Linux tarball]]
+- [[No->Talk to a Volunteer]]

linux/directory.tw2

@@ -0,0 +1,40 @@
+::Linux directory
+# Moving the Exetuable to `~/bin`
+
+Once you downloaded and extracted the
+archive you need to put in `~/bin`.
+
+First, let’s make sure the directory exists:
+
+```
+mkdir -p ~/bin
+```
+
+Next, let’s move the `exercism` executable there:
+
+```
+mv exercism ~/bin
+```
+
+Make sure everything worked:
+
+```
+~/bin/exercism
+```
+
+The above should output something like the below:
+```
+NAME:
+   exercism - A command line tool to interact with http://exercism.io
+
+USAGE:
+   exercism [global options] command [command options] [arguments...]
+…
+```
+
+---
+
+## Did running `~/bin/exercism` outout something like the above?
+
+- [[Yes->Linux path]]
+- [[No->Talk to a Volunteer]]

linux/introduction.tw2

@@ -0,0 +1,14 @@
+::Linux Introduction
+# Installing Exercism on Linux
+
+To install Exercism on Linux you need to get the `exercism`
+executable; different process architectures have different
+`exercism` executables, so you need to install the
+right exectuable matching your process architecture.
+
+---
+
+## Do you know your process architecture (32-bit vs 64-bit vs ARM)?
+
+- [[Yes->Linux tarball]]
+- [[No->Linux architecture]]

linux/path.tw2

@@ -0,0 +1,47 @@
+::Linux path
+# Adding `~/bin` to `$PATH` in Bash
+
+Note: If you’re not running Bash try to adjust the
+below to your shell or [[Talk to a Volunteer]].
+
+To have the `exercism` executable available everywhere on the
+command line you need to make sure `~/bin` is in your `$PATH`.
+
+There is a chance it’s there already; let’s see whether it is:
+
+```
+[[ ":$PATH:" == *":$HOME/bin:"* ]] && echo "~/bin is in PATH" || echo "~/bin is not in PATH"
+```
+
+If the above prints `~/bin is not in PATH` let’s add
+`~/bin` to `$PATH` and reload Bash configuration:
+
+```
+echo "export PATH=~/bin:$PATH" >> ~/.bash_profile
+source ~/.bash_profile
+```
+
+To check whether this worked, go to your home directory
+and try to run `exercism` without providing the path:
+
+```
+cd
+exercism
+```
+
+The above should output something like the below:
+```
+NAME:
+   exercism - A command line tool to interact with http://exercism.io
+
+USAGE:
+   exercism [global options] command [command options] [arguments...]
+…
+```
+
+---
+
+## Did running `exercism` outout something like the above?
+
+- [[Yes->Installation complete]]
+- [[No->Talk to a Volunteer]]

linux/tarball.tw2

@@ -0,0 +1,30 @@
+::Linux tarball
+# Getting the Executable
+
+## Download the archive
+
+If you know your process architecture (32-bit vs 64-bit vs
+ARM), download the appropriate archive from the [releases
+page](https://github.com/exercism/cli/releases/latest).
+
+## Extract from the archive
+
+Once you have the archive downloaded you
+need to extract the executable from it.
+
+* If you’re using a graphic interface (e.g., GNOME or
+Unity on Ubuntu): go to your downloads directory, right
+click on the downloaded file and select _Extract Here_.
+
+* If you’re using the command line (use the
+right archive file name for your architecture):
+```
+tar -xf exercism-linux-64bit.tgz
+```
+
+---
+
+## Next steps:
+
+- [[Continue->Linux directory]]
+- [[I don’t know my process architecture->Linux architecture]]

table_of_contents.tw2

@@ -3,6 +3,12 @@ common/welcome.tw2
 common/install_complete.tw2
 common/talk_to_a_volunteer.tw2
 
+linux/architecture.tw2
+linux/directory.tw2
+linux/introduction.tw2
+linux/path.tw2
+linux/tarball.tw2
+
 mac/introduction.tw2
 mac/opening_the_terminal.tw2
 mac/opening_the_terminal_troubleshooting.tw2