#!/usr/bin/env python
# coding: utf-8

# # Command-Line Mystery
# 
# This notebook sets you up for running Noah Veltman's [commandline mystery](https://github.com/veltman/clmystery).

# To check where we are, display the current working directory.
# 
# There are a several of ways we can do this, either using IPython magic:

# In[38]:


get_ipython().run_line_magic('pwd', '')


# or a command line / shell command invocation:

# In[39]:


get_ipython().system('pwd')


# ### Download the mystery
# 
# The mystery files are provided in a zip file that we can download from `https://github.com/veltman/clmystery/archive/master.zip`.
# 
# The `%%bash` block cell magic allows us to write several `bash` shell commands, that all execute wihting the same shell environment, in a single code cell:

# In[11]:


get_ipython().run_cell_magic('bash', '', '#Download (wget) the file from the specified URL quietly (-q)\nwget -q https://github.com/veltman/clmystery/archive/master.zip\n\n#Unzip the file very quietly (-qq)\nunzip -qq master.zip\n\n#Delete the downloaded zip file\nrm master.zip\n\n#Display the contents of the unzipped file directory\nls clmystery-master\n')


# It probably makes sense to read the `README.html`

# In[40]:


get_ipython().system('cat clmystery-master/README.md')


# Just before you get started on solving the mystery, it's worth noting that each time we run a shell command using `!`, or use the `%%bash` magic, the commands are run in their own shell:

# In[30]:


#Print (echo) the current directory (pwd)
get_ipython().system('echo $(pwd)')

#Change directory to the parent directory
# then (;) show the current directoy
get_ipython().system('cd ..; echo $(pwd)')

#Show the current directory
get_ipython().system('echo $(pwd)')


# To "persistently" change the current directory, we need to change the directory used in the outer IPython environment from which the shell commands are run. We can do this using the `%cd` line magic:

# In[33]:


get_ipython().run_line_magic('cd', 'clmystery-master/mystery')
get_ipython().system('pwd')


# List the contents of the current directory...:

# In[17]:


get_ipython().system(' ls')


# The instructions suggest we need to start by looking at the crimescene report:

# In[ ]:


get_ipython().system('cat crimescene')


# There's rather a lot in there, but we're told the clues are marked as a `CLUE`. TO get you started, here's one way of filtering out those items — use the `grep` command to search for lines containing the word `CLUE`:

# In[21]:


get_ipython().system('grep CLUE crimescene')


# Now get to it...