Bash Shell Scripting - Variables - Basic Concepts

The video tutorial covers basic concepts of variables in bash scripting, focusing on naming conventions, declaring variables, and using curly braces. It explains the set and unset commands, including the set -U option, and discusses different types of variables such as local, environmental, and shell variables. The video is theoretical, with practical demonstrations promised in future modules.

What is a key reason to avoid using predefined variable names in bash?

• They are case-sensitive.

• They may override existing session variables.

• They can cause syntax errors.

• They are not recognized by the shell.

Which naming convention is generally recommended for bash variables?

• Mixed case

• CamelCase

• Lowercase

• Uppercase

What is crucial to remember when declaring a variable in bash?

• Use spaces around the equal sign.

• Avoid using numbers in the name.

• Always use uppercase letters.

• Do not use spaces around the equal sign.

What is the purpose of using curly braces in variable names?

• To convert variable names to uppercase.

• To ensure correct variable substitution.

• To declare a variable.

• To define a variable scope.

What does the 'set -u' command do in a bash script?

• It displays an error for unset variables.

• It unsets all variables.

• It sets a variable to uppercase.

• It initializes all variables.

Which type of variable is accessible only in the current shell instance?

• Local variable

• Global variable

• Environmental variable

• Shell variable

What is the effect of using the 'unset' command on a variable?

• It makes the variable read-only.

• It converts the variable to lowercase.

• It deletes the variable completely.

• It resets the variable to zero.