Defining a Bash function with arguments | LPIC-1 102-500 Exam original practice question

105.1Standard

Create a function invoked as backup archive.tar.gz source-dir.

Pass the first and second arguments to tar -czf.

Which definition is appropriate?

Hint 1: Focus on the requirement

Identify what must change and what must remain unchanged. Then choose the command whose scope matches that requirement.

Hint 2: Check each command's role

Separate commands that display information, change state, remove data, or affect a child process.

backup() { tar -czf "$1" "$2"; }: Correct. The function passes the first and second call arguments to tar.
backup() { tar -czf "$0" "$1"; }: Incorrect. $0 is normally the shell or script name, not the first function argument.
alias backup='tar -czf $1 $2': Incorrect. An alias does not provide function-style positional parameters.
backup { tar -czf "$1" "$2" }: Incorrect. The required function syntax and command terminator are missing.

Detailed explanation

Correctbackup() { tar -czf "$1" "$2"; }

Correct. The function passes the first and second call arguments to tar.

Incorrectbackup() { tar -czf "$0" "$1"; }

Incorrect. $0 is normally the shell or script name, not the first function argument.

Incorrectalias backup='tar -czf $1 $2'

Incorrect. An alias does not provide function-style positional parameters.

Incorrectbackup { tar -czf "$1" "$2" }

Incorrect. The required function syntax and command terminator are missing.

An example you can run in a temporary verification environment.

bash --noprofile --norc -c 'backup(){ printf "out=%s src=%s\n" "$1" "$2"; }; backup archive.tar.gz source-dir'

out=archive.tar.gz src=source-dir

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-105-612

EnvironmentGNU Bash 5.2 / 一時関数

Last technical review2026-08-13