XK0-006 Automation, Orchestration, and Scripting Practice Question
In a bash script, a variable is set as follows: myvar='Hello World'. Which of the following correctly prints the first 5 characters of the variable?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
echo ${myvar:0:5}
Parameter expansion ${myvar:0:5} extracts a substring starting at position 0 of length 5. The other options are incorrect syntax.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
echo ${myvar#?????}
Why it's wrong here
This removes the shortest prefix matching pattern; not substring extraction.
- ✓
echo ${myvar:0:5}
Why this is correct
Correct. Extracts substring of length 5 from start.
- ✗
echo ${myvar:0-5}
Why it's wrong here
This returns from 5th character from end to end.
- ✗
echo ${myvar:5}
Why it's wrong here
This returns from position 5 to end.
Go deeper
Related to this question
Learn chapter
Installing Linux and Package Management
Key term
Bash script
A Bash script is a text file containing a sequence of commands for the Unix shell Bash, allowing users to automate repetitive tasks and streamline system administration on Linux and macOS.
Key term
Bash
Bash is a command-line interpreter that lets users interact with an operating system by typing text commands instead of clicking icons.
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