For example, the following command will simply execute the ls -a command, given that it exists in history with number 235: dothis 235 All it does is execute the command that resides on the number that was passed as an argument in the user’s history. We will first create a dummy executable script called dothis. preventing errors and improving their experience by hiding or showing options based on what they have already typed.helping them know the available continuations to their commands. saving them from typing text when it can be auto-completed.The nature of the completion options vary, from simple static to highly sophisticated. The completion script is code that uses the builtin Bash command complete to define which completion suggestions can be displayed for a given executable. Free online course: RHEL Technical Overview.
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