This demonstrates providing a default value for a variable if it is unset or null.

This demonstrates accessing the first argument passed to a script or function.

This demonstrates the use of $@ to handle all positional parameters passed to a script or function in Bash.

This demonstrates checking if a file exists and is executable using the -x flag.

This demonstrates basic regex matching in Bash using the =~ operator.

This demonstrates executing a Bash script in debugging mode using the -x option to print each command as it is executed.

This demonstrates checking if a file exists and is a regular file using the -f condition in Bash.

This demonstrates checking if a string is empty or not using -z and -n operators in a Bash conditional statement.

This demonstrates retrieving the directory path of the last argument from the previous command in Bash.

This demonstrates various operations on an array in Bash, including accessing elements, counting elements, slicing, and listing indices.

This demonstrates the use of Bash history expansion to refer to the first argument of the previous command.

This demonstrates referencing a range of arguments from the previous command using Bash history expansion.

This demonstrates displaying the command history in Bash.

This demonstrates executing a Bash script with the -e option to enable immediate exit on error.

This demonstrates using Bash's history expansion to substitute a string in the last executed command.

This demonstrates a case statement for command-line argument handling in Bash.

This demonstrates error handling in Bash using the trap command to catch errors and display the line number where they occurred.

This demonstrates sourcing a script located in a relative path from the current script's directory.

This demonstrates referencing the nth argument from the previous command using history expansion.

This demonstrates the use of the special variable $? to check the exit status of the last executed command.