Merge pull request #10 from DeNepo/02-variables-and-shell-expansions

add 02-variables-and-shell-expansions

00-build-bash-script/0-examples/00.sh

@@ -1,8 +1,8 @@
-#!/bin/bash  
+#!/opt/homebrew/bin/bash
 
 # Author: Samir M.
 # Date: 2024-03-12
-# Modified: 2024-03-12
+# Version : 1.0
 # Description: The main components of a shell script
 # Usage: ./00.sh
 
@@ -16,9 +16,10 @@
 
 # 3. Exit status will be at the end of the script
 
-exit 0 
 #-------------------------------------------------------------#
 
+exit 0
+
 # How to run the script:
 # 1. Open the terminal
 # 2. `chmod 744 <path-to-the-script>`

00-build-bash-script/0-examples/01.sh

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # Author: Samir M.
 # Date: 2024-03-12
-# Modified: 2024-03-12
+# Version : 1.0
 # Description: echo command
 # Usage: ./01.sh
 
@@ -18,16 +18,10 @@ echo -e "Hello,\tWorld! third example"
 
 # What is the difference between the three echo commands above?
 
-exit 0
-
 #-------------------------------------------------------------#
+exit 0
 
 # How to run the script:
 # 1. Open the terminal
 # 2. `chmod 744 <path-to-the-script>`
 # 3. `./<path-to-the-script>`
-
-
-
-
-

00-build-bash-script/0-examples/02.md

@@ -2,7 +2,7 @@
 
 ## Introduction
 
-The `$SHELL` variable in Unix-like operating systems is an environment variable that holds the path to the user's preferred shell.
+The `$SHELL` variable in Unix-based and Unix-like operating systems is an environment variable that holds the path to the user's default shell.
 
 ## Usage
 
@@ -38,5 +38,5 @@ This command sets the default shell to Zsh, for example.
 When working with the `$SHELL` variable:
 
 - Ensure compatibility by using the appropriate syntax for the current shell.
-- Use the `$SHELL` variable dynamically in scripts to adapt to users' preferences.
+- Use the `$SHELL` variable dynamically in scripts to adapt to user's preferences.
 - Be cautious when changing the default shell, considering compatibility with existing scripts and configurations.

00-build-bash-script/0-examples/02.sh

@@ -1,14 +1,14 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # Author: Samir M.
 # Date: 2024-03-12
-# Modified: 2024-03-12
+# Version: 1.0
 # Description: The $SHELL varibale
 # Usage: ./02.sh
 
 #-------------------------------------------------------------#
 
-# $SHELL is a shell variable that contains the path to the current shell
+# $SHELL is a shell variable that contains the path to the default shell
 
 echo "$SHELL"
 
@@ -19,11 +19,10 @@ echo "Your default shell is {$SHELL}"
 # Can I change the default shell? How?
 # Are there any other shell variables?
 
-exit 0
-
 #-------------------------------------------------------------#
+exit 0
 
 # How to run the script:
 # 1. Open the terminal
 # 2. `chmod 744 <path-to-the-script>`
-# 3. `./<path-to-the-script>`
+# 3. `./<path-to-the-script>`

00-build-bash-script/0-examples/03.sh

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # Author: Samir M.
 # Date: 2024-03-02
-# Modified: 2024-03-02
+# Version: 1.0
 # Description: Comments in bash script.
 # Usage: ./02.sh
 
@@ -12,21 +12,18 @@
 
 # Single line comment.
 
-
 # Multi-line comment.
 # Multi-line comment.
 # Multi-line comment.
 
 echo "Comments in bash script." # Inline comment.
 
-# Why the shebang is not a comment?
-
-exit 0
+# is the shebang a comment?
 
 #-------------------------------------------------------------#
+exit 0
 
 # How to run the script:
 # 1. Open the terminal
 # 2. `chmod 744 <path-to-the-script>`
 # 3. `./<path-to-the-script>`
-

00-build-bash-script/0-examples/04.sh

@@ -2,24 +2,24 @@
 
 # Author: Samir M.
 # Date: 2024-03-02
-# Modified: 2024-03-02
+# Version: 1.0
 # Description: Make your script more professional.
 # Usage: ./04.sh
 
 #-------------------------------------------------------------#
 
 # To make your script more professional, you can use 5 pecies of information
 
-# 1. Author : the name of the person who created the script
-# 2. Date of creation : the date when the script was created
-# 3. Modified date : the date when the script was last modified
-# 4. Description : what the script does
-# 5. Usage : how to use the script 
+# 1. Author      : the name of the person who created the script
+# 2. Date        : the date when the script was created
+# 3. Version     : the version of the script
+# 4. Description : a brief description of the script
+# 5. Usage       : how to use the script
 
+#-------------------------------------------------------------#
 exit 0
 
-#-------------------------------------------------------------#
 # How to run the script:
 # 1. Open the terminal
 # 2. `chmod 744 <path-to-the-script>`
-# 3. `./<path-to-the-script>`
+# 3. `./<path-to-the-script>`

00-build-bash-script/0-examples/05.sh

@@ -1,34 +1,32 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # Author: Samir M.
 # Date: 2024-03-12
-# Modified: 2024-03-12
+# Version: 1.0
 # Description: Add and remove scripts to/from the PATH
 # Usage: ./05.sh
 
 #-------------------------------------------------------------#
 
-
 # To see the PATH variable, you can use the following command
 echo "{$PATH}"
 
 # Add scripts to the PATH allows you to run the script from any directory without specifying the full path
 
 ## To add 0-examples to the PATH, you can use the following command (replace the path with your own)
-export PATH=$PATH:$HOME/Desktop/work/master-classes/bash-scripting/00-build-bash-script/0-examples
+export PATH=$PATH:$HOME/Desktop/denepo/bash-scripting/00-build-bash-script/0-examples
 
 echo "{$PATH}"
 
 ## To remove 0-examples from the PATH, you can use the following command (replace the path with your own)
-export PATH=${PATH%:"$HOME"/Desktop/work/master-classes/bash-scripting/00-build-bash-script/0-examples}
+export PATH=${PATH%:"$HOME"/Desktop/denepo/bash-scripting/00-build-bash-script/0-examples}
 
 echo "{$PATH}"
 
-exit 0
-
 #-------------------------------------------------------------#
+exit 0
 
 # How to run the script:
 # 1. Open the terminal
 # 2. `chmod 744 <path-to-the-script>`
-# 3. `./<path-to-the-script>`
+# 3. `./<path-to-the-script>`

00-build-bash-script/0-examples/06.sh

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # Author: Samir M.
 # Date: 2024-03-12
-# Modified: 2024-03-12
+# Version: 1.0
 # Description: Set up secure script permissions
 # Usage: ./06.sh
 
@@ -29,11 +29,10 @@ ls -l 06.sh
 # chmod 744 <file-name>.sh
 # 744 means that the owner has read, write and execute permission, and the group and public have only read permission
 
-exit 0
-
 #-------------------------------------------------------------#
+exit 0
 
 # How to run the script:
 # 1. Open the terminal
 # 2. `chmod 744 <path-to-the-script>`
-# 3. `./<path-to-the-script>`
+# 3. `./<path-to-the-script>`

00-build-bash-script/1-blanks/00.sh

@@ -1,8 +1,8 @@
-#!/bin/bash  
+#!/opt/homebrew/bin/bash
 
 # Author: Samir M.
 # Date: 2024-03-12
-# Modified: 2024-03-12
+# Version: 1.0
 # Description: The main components of a shell script
 # Usage: _/__.sh
 
@@ -21,11 +21,5 @@
 # The exit status is a ________ value that a script returns upon completion.
 # Typically, ___ indicates success and non _____ indicates failure.
 
-exit 0
 #-------------------------------------------------------------#
-
-# How to run the script:
-# 1. Open the ________
-# 2. `chmod ___ <path-to-the-script>`
-# 3. `./<path-to-the-script>`
-
+exit 0

00-build-bash-script/1-blanks/01.sh

@@ -1,33 +1,22 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # _______: Samir M.
 # Date: 2024-03-12
-# Modified: 2024-03-12
+# Version: 1.0
 # Description: echo command
 # ______: ./01.sh
 
 #-------------------------------------------------------------#
 
 echo "__________ first example" # Hello, World! first example
 
-echo -e "__________ second example" 
+echo -e "__________ second example"
 # Hello,
 # World! second example
 
 echo -e "__________ third example" # Hello, World! third example
 
 # What is the difference between the three echo commands above?
 
-exit 0
 #-------------------------------------------------------------#
-
-# How to run the script:
-# 1. Open the ________
-# 2. `chmod ___ <path-to-the-script>`
-# 3. `./<path-to-the-script>`
-
-
-
-
-
-
+exit 0

00-build-bash-script/1-blanks/02.sh

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # Author: __________
 # Date: __________
-# Modified: __________
+# Version: __________
 # Description: The $SHELL variable
 # Usage: ./___.sh
 
@@ -19,11 +19,5 @@ echo "Your default shell is {________}"
 # Can I change the default shell? How?
 # Are there any other shell variables?
 
-exit 0
-
 #-------------------------------------------------------------#
-
-# How to run the script:
-# 1. Open the ________
-# 2. `chmod ___ <path-to-the-script>`
-# 3. `./<path-to-the-script>`
+exit 0

00-build-bash-script/1-blanks/03.sh

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # Author: __________
 # Date: __________
-# Modified: __________
+# Version: __________
 # Description: Comments in bash script.
 # Usage: ./___.sh
 
@@ -21,15 +21,8 @@
 echo "Comments in bash script." # Inline comment.
 # Inline comments start with the ________ symbol and extend to the end of the line.
 
-# Why the shebang is not a comment?
-# The shebang is not a comment because it is ________ by the shell to determine the ________ to be used for executing the script.
+# Is shebang a comment?
+# The shebang is a special comment because it is ________ by the shell to determine the ________ to be used for executing the script.
 
-exit 0
 #-------------------------------------------------------------#
-
-# How to run the script:
-# 1. Open the ________
-# 2. `chmod ___ <path-to-the-script>`
-# 3. `./<path-to-the-script>`
-
-
+exit 0

00-build-bash-script/1-blanks/04.sh

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/opt/homebrew/bin/bash
 
 # Author: __________
 # Date: __________
-# Modified: __________
+# Version: __________
 # Description:  Make your script more professional.
 # Usage: ./___.sh
 
@@ -12,13 +12,9 @@
 
 # 1. __________ : the name of the person who created the script
 # 2. __________ : the date when the script was created
-# 3. __________ : the date when the script was last modified
+# 3. __________ : the version of the script
 # 4. __________ : what the script does
-# 5. __________ : how to use the script 
+# 5. __________ : how to use the script
 
-exit 0
 #-------------------------------------------------------------#
-# How to run the script:
-# 1. Open the ________
-# 2. `chmod ___ <path-to-the-script>`
-# 3. `./<path-to-the-script>`
+exit 0