Removing one alias | LinuC Level 1 102 Exam original practice question

1.06.1Basic

Remove only the ll alias from the current Bash.

Keep all other aliases.

Which command is appropriate?

Hint 1: Focus on shell scope

Separate login and non-login shells, interactive behavior, current-shell changes, and command expansion before comparing the choices.

Hint 2: Key terms

Review the short definitions of the shell files, process boundaries, and expansion rules involved.

unalias: A shell builtin that removes a named alias definition.
-a: The unalias option that targets every alias currently defined.
unset: A builtin that removes shell variables or functions.
Alias definition: A shell-internal mapping from an input name to an expansion string.
Namespace: A separate definition space in which variables, functions, and aliases are managed.

Detailed explanation

Incorrectunset ll

Incorrect. unset does not remove an alias definition.

Incorrectalias -a

Incorrect. alias -a is not the Bash form for removing one alias.

Incorrectunalias -a

Incorrect. unalias -a removes all aliases.

Correctunalias ll

Correct. unalias ll removes only ll.

An example you can run in a temporary verification environment.

bash --noprofile --norc -ic "alias ll='printf ok'; unalias ll; alias ll 2>/dev/null || echo removed"

removed

Foundation review

A shell builtin that removes a named alias definition.

The unalias option that targets every alias currently defined.

A builtin that removes shell variables or functions rather than aliases.

Question IDKL-102-910

EnvironmentGNU Bash 5.2 / 一時対話シェル

Last technical review2026-08-13

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