week4/4-unix-ninja

Unix Ninja Part 1

Are you ready to become a Unix ninja?

Today you're going to start on the path to mastering your Terminal. If you want to be a master young grasshopper, you must not be afraid of the sandbox.

cat

The first command you need to know is cat. cat will output a file, or "catenate" multiple files.

Try to cat both csv files in the directory, seperately and together.

You can even save join them and save them combined to a new file. Do it!

grep

The next command we need is grep.

Grep searches any file or output for a regular expression you provide.

grep each csv file just for occurences of the string 'tie'.

Now output both files using cat and grep them both for the string 'tie'. You'll need to use a pipe to pass the output of cat to grep.

Sandbox! grep more stuff and get results from both files.

Now pipe commands you use all the time to grep - like ls, git status and anything else you can think of.

sort

Add sort into the mix. Sort each file, and sort them combined with cat.

Join them with cat, pipe to grep and look for all lines that contain the string "zo" and pipe them to sort to sort them.

wc

wc is word count. It will give you the number of words, lines, and characters from an output. What is the total number of full names in the name file? What is the total number of words for occurences of the string 'tie' in both files? Pipe them all together!

How about some more? How many words are in the man page for grep? How many lines contain the word "repo" in git --help?

Bonus - curl

curl will output a web data in your terminal. curl http://www.seamless.com and grep for all occurrences of the word "sandwich". How about we get all the links on the page? grep for occurrences of "href". How many lines are returned?

curl reddit and save the page to an html file.