Modif PY exercises

Bash.md

@@ -5,7 +5,7 @@ author: P.Y. Barriat
 description: Introduction to Bash Scripting
 backgroundImage: url('assets/back.png')
 _backgroundImage: url('assets/garde.png')
-footer: 17/10/2023 | Introduction to Bash Scripting
+footer: 10/10/2024 | Introduction to Bash Scripting
 _footer: ""
 paginate: true
 _paginate: false
@@ -254,25 +254,14 @@ Consider `string=abcABC123ABCabc` and `filename=myfile.txt`
   * `${string:7:3}` is `23A`
   * `${string:(-4)}` or `${string: -4}` is `Cabc` 
 * substring removal from front :
-  * `${string#a*C}` is `123ABCabc`
   * `${filename##myfile}` is `.txt`
-
-<!-- WARNING -->
-
----
-
 * substring removal from back :
-  * `${string%b*c}` is `abcABC123ABCa`
   * `${filename%%.txt}` is `myfile`
 
-## Variable expansion
+<!--## Variable expansion
 
 * `${variable-default}` : 
-  if `variable` is unset or null, the expansion of `default` is substituted
-* `${variable+default}` : 
-  if `variable` is unset or null, nothing is substituted, otherwise the expansion of  `default` is substituted
-
-<!-- WARNING -->
+  if `variable` is unset or null, the expansion of `default` is substituted-->
 
 ---
 
@@ -454,12 +443,16 @@ esac
 
 1. In your `bash_exercises` folder create a new bash file called `exercise_2.sh` and make it executable
 2. Ask the user for two numbers smaller or equal to 100, put them in variables `NUMBER1` and `NUMBER2`
-> `read NUMBER1`
-> `read NUMBER2`
-3. Do the following only if the numbers are smaller than 100
-4. Otherwise, check if both numbers are even, and tell the user   
-5. If the user's numbers ar too big, tell them
-> `echo 'message'`
+
+   > ```bash
+   > #!/bin/bash
+   > read NUMBER1
+   > read NUMBER2
+   >```
+
+3. Check if the numbers are smaller than 100
+   - If yes, check if both numbers are even and tell the user
+   - If not, tell the user with `echo 'my message'`
 
 ---
 
@@ -552,6 +545,8 @@ Basic loop structures in Bash scripting :
 ### Examples
 
 ```bash
+#!/bin/bash
+
 # Basic while loop
 counter=0
 while [ $counter -lt 3 ]; do
@@ -611,13 +606,12 @@ done
 
 # Hands-on exercise
 
-Speed game:
-
-1. Use the following website to get a list of random words: https://randomwordgenerator.com and put them together in a variable
-2. Register the start time with `date +%s` and put it in a variable `TSTART`
-3. Loop over the words and ask the user to give the number of letters. Echo the answers.
-4. Register the end time in `TEND`
-5. Display the total run time and the score.
+1. In your `bash_exercises` folder create a new bash file called `exercise_3.sh` and make it executable
+2. Use the following website to get a list of 10 random words: https://randomwordgenerator.com and put them together in an array
+3. Register the start time with `date +%S` and put it in a variable `tstart`
+4. Loop over the words and ask the user to give the number of letters. Echo the answers.
+5. Register the end time in `tend`
+6. Display the total run time and the total number of letters.
 
 ---
 
@@ -808,8 +802,10 @@ _files="$@"
 
 # Hands-on exercise
 
-<!-- Repartir de l'exercise précédent. Stocker les résultatst dans un fichier au lieu de stdin.
-Puis; lire ce fichier pour compter le score. -->
+1. In your `bash_exercises` folder, copy `exercise_3.sh` to `exercise_4.sh`
+2. In this new file, loop over the words and write the number of letters of each word in a new file called `output.txt`
+3. Now loop over the created file `output.txt` to get the total number of letters
+4. Display the total run time and the total number of letters
 
 ---
 
@@ -827,11 +823,10 @@ hello_world () {
 }
 hello_world
 ```
+Functions must be declared **before** they are used
 
 > defining a function doesn’t execute it
 
-Functions must be declared **before** they are used
-
 ---
 
 ## Variables Scope
@@ -919,7 +914,7 @@ print_something Mars
 
 # Hands-on exercise
 
-1. Write a script called `exercise_4.sh` expecting **2 arguments**. If not exactly two arguments are provided, exit with an error and show a "usage" message to the user.
+1. Write a script called `exercise_5.sh` expecting **2 arguments**. If not exactly two arguments are provided, exit with an error and show a "usage" message to the user.
 2. Write a function taking a **folder path** and an **extension** as arguments and giving the list of matching files to the user
 <!-- 3. Imagine you are running jobs taking data from two folders, each with a dedicated extension. Use the two arguments of the script as the name of the two folders and **get the two lists of files**. 
 4. Since your work needs to read these files, **check that all files can be read**. If some files cannot be read, display their name to the user-->
@@ -1109,6 +1104,4 @@ echo "done"
 ```bash
 time ./manager_seq.sh
 time ./manager_par.sh
-```
-
----
\ No newline at end of file
+```
\ No newline at end of file