docs(bin-status): fix the usage of bin status

format readmes of other exercises

subjects/devops/bin-status/README.md

@@ -7,9 +7,9 @@ Create the script `bin-status.sh` that will return the exit status of last comma
 - Expected output:
 
 ```console
-$ true ; ./bin-status.sh
+$ true ; source ./bin-status.sh
 0
-$ false ; ./bin-status.sh
+$ false ; source ./bin-status.sh
 1
 $
 ```
@@ -27,5 +27,7 @@ $ random-binary ; echo $?
 $
 ```
 
+The `source` command is used in Unix-like operating systems to execute commands from a specified file in the current shell environment. When the `source` command is used, the specified file is read by the shell and executed in the same environment as the caller, without creating a new subshell.
+
 > You have to use Man or Google to know more about commands flags, in order to solve this exercise!
-> Google and Man will be your friends!
+> Google and Man will be your friends!

subjects/devops/calculator/README.md

@@ -8,6 +8,7 @@ In this exercise you will make a script `calculator.sh` that will take 3 argumen
 - The second argument will be the operator.
 
 Each operator should have its own function named as follow:
+
 - `+`: `do_add()`.
 - `-`: `do_sub()`.
 - `*`: `do_mult()`.
@@ -36,6 +37,7 @@ $
 ### Error handling
 
 All errors will print a specific message on **stderr** (ending with a newline) and returns a specific non-zero value:
+
 - Wrong number of arguments: `"Error: expect 3 arguments"`, returns `1`.
 - Division by 0: `"Error: division by 0"`, exit with `2`.
 - Invalid operator: `"Error: invalid operator"`, exit with `3`.
@@ -46,25 +48,26 @@ All errors will print a specific message on **stderr** (ending with a newline) a
 ### Hints
 
 - `case` statement example:
+
 ```sh
 # Check the first argument given to a script
 case $1 in
     "left")
         echo "We will turn left"
         ;;
-    
+
     "right")
         echo "We will turn right"
         ;;
-    
+
     "top")
         echo "We will turn top"
         ;;
-    
+
     "bottom")
         echo "We will turn bottom"
         ;;
-    
+
     # Any other case
     *)
         # This is printed in stderr
@@ -75,7 +78,8 @@ esac
 ```
 
 - Example of a function taking two arguments and returning a value by printing it.
-The behavior of this function is the same than the one expected for the operators functions you will create:
+  The behavior of this function is the same than the one expected for the operators functions you will create:
+
 ```sh
 print_full_name () {
     name=$1
@@ -86,11 +90,11 @@ print_full_name () {
 print_full_name "Gene" "Mallamar"
 ```
 
-> Google and Man will be your friends!  
+> Google and Man will be your friends!
 
 ### References
 
-- [Bash functions](https://linuxize.com/post/bash-functions/)  
-- [Test if a variable is a number](https://stackoverflow.com/questions/806906/how-do-i-test-if-a-variable-is-a-number-in-bash)  
-- [Print on standard error](https://stackoverflow.com/questions/2990414/echo-that-outputs-to-stderr)  
-- [Case statement](https://linuxize.com/post/bash-case-statement/)  
+- [Bash functions](https://linuxize.com/post/bash-functions/)
+- [Test if a variable is a number](https://stackoverflow.com/questions/806906/how-do-i-test-if-a-variable-is-a-number-in-bash)
+- [Print on standard error](https://stackoverflow.com/questions/2990414/echo-that-outputs-to-stderr)
+- [Case statement](https://linuxize.com/post/bash-case-statement/)

subjects/devops/check-user/README.md

@@ -5,6 +5,7 @@
 In this exercise you will make a script `check-user.sh` that will take 2 arguments and return information about the selected user, always ended by a new line.
 
 The first argument will be a flag defining the behavior of the script:
+
 - `-e`: check if the user exists, returns `yes` or `no` appropriately.
 - `-i`: returns information about the user.
 
@@ -30,10 +31,12 @@ $
 ### Error handling
 
 All errors will print a specific message on **stderr** (ending with a newline) and returns a specific non-zero value:
+
 - Wrong number of arguments: `"Error: expect 2 arguments"`, exit with `1`.
 - First argument different from `-e` or `-i`: `"Error: unknown flag"`, exit with `1`.
 
 ### Hints
+
 - `getent` is a command to get entries from a database. `passwd` is the database where information about users is stored.
 - `getent passwd` will give you the list of all users.
 - `getent passwd <username>` will give you information about a specific user.
@@ -42,4 +45,5 @@ All errors will print a specific message on **stderr** (ending with a newline) a
 > `man getent` will provide extensive documentation about this command.
 
 ### Resources
-> [List Linux users](https://linuxize.com/post/how-to-list-users-in-linux/)  
+
+> [List Linux users](https://linuxize.com/post/how-to-list-users-in-linux/)

subjects/devops/custom-ls/README.md

@@ -5,11 +5,12 @@
 Create the script `custom-ls.sh` which will create an alias `custom-ls`.
 
 The alias `custom-ls`:
-  - shows the file details in long list format.
-  - does not list group information.
-  - does not ignore entries starting with `.`.
-  - prints the allocated  size of each file, in blocks.
-  - sorts by file size, largest first.
+
+- shows the file details in long list format.
+- does not list group information.
+- does not ignore entries starting with `.`.
+- prints the allocated size of each file, in blocks.
+- sorts by file size, largest first.
 
 Expected behavior:
 
@@ -28,7 +29,7 @@ $
 
 An alias is a shortcut that references a command. An alias replaces a string that invokes a command in the Linux shell with another user-defined string.
 
-`alias` command instructs the shell to replace one string with another string while executing the commands. 
+`alias` command instructs the shell to replace one string with another string while executing the commands.
 
 ```console
 $ alias testcmd="echo 01school"
@@ -45,17 +46,22 @@ $
 To create and add aliases permanently to your bash shell on Linux and Unix-like systems:
 
 1- Edit the `~/.bashrc`:
+
 ```console
 vi ~/.bashrc
 # or #
 nano ~/.bashrc
 ```
+
 2- Append your bash alias, For example append:
+
 ```console
 alias testcmd="echo 01school"
 ```
+
 3- Save and close the file.
 4- Activate alias
+
 ```console
 source ~/.bashrc
 ```

subjects/devops/hard-conditions/README.md

@@ -9,7 +9,7 @@ If it exists and it is executable you must print "File is executable" if it is n
 
 ```console
 $ ls -l
--rw-rw-r-- 1 miguel miguel    19 dez 28 14:19  docs
+-rw-rw-r-- 1 user user    19 dez 28 14:19  docs
 -rwxrwxr-x 1 user user    95 dez 29 15:48  example.sh
 $ ./hard-conditions.sh path/to/example.sh
 File is executable