You want to assign a default value to path only if it is unset or empty, but also want to save the default back to path. Which syntax should you use?

hard🚀 Application Q8 of 15

Bash Scripting - String Operations

You want to assign a default value to path only if it is unset or empty, but also want to save the default back to path. Which syntax should you use?

Apath=${path:-"/usr/local/bin"}

Bpath=${path-"/usr/local/bin"}

Cpath=${path+"/usr/local/bin"}

Dpath=${path:="/usr/local/bin"}

Step-by-Step Solution

Solution:

Step 1: Understand difference between :- and :=
${var:-default} returns default if unset or null but does not assign it back; ${var:=default} assigns default to var if unset or null.
Step 2: Choose syntax that assigns default back
Only ${path:="/usr/local/bin"} assigns the default value back to path.
Final Answer:
path=${path:="/usr/local/bin"} -> Option D
Quick Check:
Use := to assign default back [OK]

Quick Trick: Use := to assign default value back to variable [OK]

Common Mistakes:

MISTAKES

Using :- which does not assign
Confusing - with := syntax
Using + which is for alternate value

Master "String Operations" in Bash Scripting

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More Bash Scripting Quizzes

You want to assign a default value to path only if it is unset or empty, but also want to save the default back to path. Which syntax should you use?

Step 1: Understand difference between :- and :=

Step 2: Choose syntax that assigns default back

Final Answer:

Quick Check:

Want More Practice?