prefix

Q1: What is compgen in the context of Bash? A1: compgen is a built-in Bash command used to display completions that match a word or pattern. It's primarily useful in scripting environments for generating possible command or variable suggestions, which makes it invaluable for dynamic command-line operations and scripts. Q2: How can I use compgen to list variables that match a specific prefix? A2: To list all variables that start with a specific prefix in Bash, you can use the -A variable option of compgen. For instance, if you want to find variables that start with USER, you would use the command: compgen -A variable USER This command would list all variable names starting with USER, such as USER, USERNAME, USER_ID, etc.