Update terminal.md

materials/terminal.md

@@ -11,34 +11,6 @@ Shell is the standard way to interact with a supercomputer. It is worth learning
 
 The terms terminal, command line and shell are often used interchangably, even though they mean slightly different things. 
 
-:::{admonition} Some terminal magic
-:class: tip
-
-Did you ever want to count all the files in a directory? Or lines in a file? Apart from opening the file in an editor, turning on line numbers or counting them manually you can also use a neat little command line tool called `wc`.
-
-Check out the documentation for `wc` and see if you can find out how to 
-1. Count the number of lines/characters of file `/appl/data/geo/syke/natura/Readme_natura.txt`.
-2. Count all directories in `/appl/data/geo/syke`.
-
-If this was too easy, can you count only the directory and file names that include `2021` in the syke directory? 
-
-You can use the "login shell" via the Puhti webinterface for this exercise.
-
-:::{admonition} Solution
-:class: dropdown
-
-`man wc` for finding the documentation. Use `q` to exit the documentation.
-
-1. `wc -m /appl/data/geo/syke/natura/Readme_natura.txt` to count the characters in the file. Or `cat /appl/data/geo/syke/natura/Readme_natura.txt | wc -m` -> 177
-2. `ls /appl/data/geo/syke | wc -l` , we pipe the output of `ls` which is a list of files into `wc` which by defining `-l`
- prints out the amount of newlines (= number of lines) -> 200
-
-Count all directory and file names that include `2021`:  `ls *2021* | wc -l` -> 156
-
-:::
-:::
-
-
 ## Basic Linux commands
 
 Do you remember on how you edited some files in the web interface? Let's do the same thing again; only from the command line:
@@ -50,29 +22,19 @@ Do you remember on how you edited some files in the web interface? Let's do the
 ```bash
 pwd
 ```
-2. Then check your username, by typing `echo $USER` and `Enter`. `$USER` (note the `$` in the beginning) is an environment variable which stores your CSC username. `echo` is a command that allows us to display text that is given as an argument (try also `echo hello`).
-
-```bash
-echo $USER
-```
 
 2. We would like to create a new directory in our projects scratch students directory with our name, let's move there:
 
 ```bash
 cd /scratch/project_200xxxx/students
 ```
 
-2. Check if there are any files:
-
-```bash
-ls
-```
 
 3. Make a directory with your name (you can either type it or use the variable $USER) and see if it appears:
 
 ```bash
 mkdir $USER    
-ls
+ls -l
 ```
 
 4. Go to that directory.
@@ -86,58 +48,19 @@ cd $USER
 If you just type `cd` and the first letter of the folder name, then hit `tab` key, the terminal completes the name. Handy!
 :::
 
-
-Add an empty file into this directory. 
-
-```bash
-touch $USER-first-file.txt    
-```
-
-Check that it is empty:
-
-```bash
-cat $USER-first-file.txt        
-```
-
-Fill it with some content:
-
-:::{admonition} Command line editor
-:class: seealso
-These exercises are done with the `nano` editor, but you can use your favorite editor too.
-Here's a [nano cheat sheet](https://www.nano-editor.org/dist/latest/cheatsheet.html).
-:::
-
-
-1. Open the file with `nano`:
-
-```bash
-nano $USER-first-file.txt     
-```
-
-2. Edit the file. Type something there!
-3. Exit `nano` with `Ctrl+X`, type `Y` to confirm saving and press enter to accept the filename.
-4. Check that the modifications are actually there:
-
-```bash
-less $USER-first-file.txt     
-```
-
-5. Exit the preview with `q`.
-
-
 ## Exploring files
 
 
 1. Download a file into this new folder. Use the command `wget` for downloading from a URL:
 
 ```bash
-wget https://github.com/csc-training/csc-env-eff/raw/master/_hands-on/linux_prerequisites/my-first-file.txt
+wget https://raw.githubusercontent.com/csc-training/csc-env-eff/master/part-1/prerequisites/my-first-file.txt
 ```
 
 2. Check what kind of file you got and what size it is using the `ls` command with some extra options:
 
 ```bash
-ls -lth         # options are l for long format, t for sorting by time and h for convenient size units. 
+ls -l         # options are l for long format, 
 ```
 
 3. Use the `less` command to check out what the file looks like:
@@ -148,24 +71,19 @@ less my-first-file.txt
 
 4. To exit the `less` preview of the file, hit `q`.
 
-:::{admonition} Tip
-:class: seealso
-Instead of `less` you can use `cat` which prints the content of the file(s) straight into the command line. For long texts `less` is recommended.
-:::
-
 5. Make a copy of this file:
 
 ```bash
 cp my-first-file.txt $USER-second-file.txt    
-ls -lth
+ls -l
 less $USER-second-file.txt                    
 ```
 
 6. Remove the file we originally downloaded (leave your own copy).
 
 ```bash
 rm my-first-file.txt
-ls
+ls -l
 ```
 
 :::{admonition} Moving files
@@ -178,9 +96,3 @@ If you don't want to have duplicate files you can use `mv` to 'move/rename' the
 :class: seealso
 If you remember *a part of a command* that you have used recently you can search for it with the command `history | grep string`. This will show all your used commands that have included the string `string` (replace this with the pattern you are searching for).
 :::
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