Created Friday 09 February 2018
Log into your virtual Lubuntu install.; Go to "Accessories" -> "LXTerminal"
You may want to maximize it, we're going to spend a lot of time here.
1a) What is the command to "list" files? Run it.
1b) What files and folders do you see?
2) Next, run the listing command, but with the "-a" flag. What does it do? How is the output now different.
With the -a flag, you should see a file called ".dmrc". Take a look at it. (note, some distros may not have this)
3) I mentioned in the slides two methods of looking at a text file, neither of which is an editor. What are they?
4) According to it, what is the name of your current session?
Let's make a new file, called test.txt, with a command-line editor. One commandthat you could use for this is the “touch” command. However, you can also simply type the name of the editor, then the name of the file. Let's use "nano" —
Type the following:
Once inside, type "This is my local test file," no quotes. Save/Close the file. (You can get clues how to do this at the bottom. Here, the symbol "^" means the Control Key. So to save, first try Control-X for "Exit" then follow the prompts.
List the directory again, but this time with the “-al” option.
5) How many bytes is test.txt? (hint: the number you're looking for is close to the date)
Lets get a bigger file; we'll use a command I covered briegly wget. First just try typing "wget" on a line by itself. That will not actually "do" anything. Next type "man wget."
6) In a sentence or two, tell me what "wget" is/does.
Okay, next, type the following:
to get a file called pg23.txt.
Once it's finished, first try
(hit q to get out of it)
7) What is the difference between less and cat?
Let's rename this file to something slightly more descriptive, but still short for us. How about fd.txt?
mv pg23.txt fd.txt
8) Non-technical question: Why "fd?"
Okay, lets use some basic commands to play around with this file a bit. A command we did see for a second in class is "sort"
9(a). Before doing anything else, describe what just happened.
9(b). In your own words — is this a surprising result? If you would like to augment or modify your answer to 9a at this point, please feel free to do so here. (you may not, but I'd like to know if you do, so thats why I'm phrasing the question this way)
What if we actually wanted to "keep" the weird thing that came out when we did the sort command? We have to use a "redirect," to redirect the output of a command to something other than stdout (Standard Output)? Try this:
sort fd.txt > fdweird.txt
Now we have two files. Lets make some backups of them. Do:
cp fd.txt fd.bak cp fdweird.txt fdweird.bak
Okay. Now: do that first command AGAIN:
sort fd.txt > fdweird.txt
10a What happened?
Finally, do this slightly different command:
sort fd.txt >> fdweird.txt
10b. Review fdweird.txt (or perhaps try another ls -a) — what happened here?
10c. What is the difference between > and >>?
Another command we looked at is the sort command, which alphabetizes things; but lets try something a little different: As above, make a file that looks like the following. Name it numbers.txt
34 78 1001 12 30 4084
(each of these numbers, on its own line, with nothing else)
11. What happened? Does this look right? If not, give me the command in the format that does this "correctly."