Removing one defined alias | LPIC-1 102-500 Exam original practice question

105.1Standard

The current Bash has an ll alias.

Remove only ll and keep all other aliases.

Which command is appropriate?

Hint 1: Focus on shell scope

Separate login and non-login startup files, current-shell changes, environment inheritance, and command lookup before comparing the choices.

Hint 2: Key terms

Review the short definitions of shell startup files, variables, aliases, functions, and command lookup.

unalias: A shell builtin that removes a named alias definition.
unalias -a: The option that removes every alias in the current shell.
alias table: The shell's mapping from alias names to replacement strings.
persistent startup file: A file read by future shells that can recreate an alias definition.

Detailed explanation

Incorrectunset ll

Incorrect. unset targets variables or functions, not aliases.

Incorrectalias -a ll

Incorrect. alias does not use this form to remove an alias.

Incorrectunalias -a

Incorrect. unalias -a removes all aliases, not only ll.

Correctunalias ll

Correct. unalias ll removes just the named alias.

An example you can run in a temporary verification environment.

bash --noprofile --norc -ic "alias ll='ls -l'; unalias ll; alias ll" 2>&1 | tail -n 1

ll: not foundに相当するエラー

Foundation review

Check whether the command acts on the current shell, a new process, an existing process, or a file.

Use the supplied command and compare the output with the expected result.

Question IDKP-105-611

EnvironmentGNU Bash 5.2 / 一時対話シェル

Last technical review2026-08-13

More practice in this area