class notes [pdf]
more v less — there is less difference between them on the mac, but you can still see the output in Terminal after you quit if you use more, but the output disappears if you use less
-lh = lists the files with the additional metadata (time created, etc.)
wc shows:
lines words bytes file_name.txt
And from the manual:
| “pipe” – from the pdf :
We use the vertical bar “|” to connect two commands together so that the output from one command becomes the input of the next command. Two (or more) commands connected in this way form what’s called a pipe.
regular expression
grep = going to count the number of lines that some element we are looking for appears in
useful for looking for a word in a file
to get out, type Ctrl+C or Ctrl+D
grep returns the number of lines, and when you conjoin it with “wc” ( via | ), it counts the number of words in each line that contains the expression that you were searching for, NOT the number of instances of the expression itself.
grep –color=auto”[laughter]” will return each character that matches those in brackets. (the brackets have a particular function in regular)
if you type “grep” in with nothing else, you get a list of available commands.