[Solved] What does the Bash expression ${var#pattern} do? - Ans: Removes the shortest matching prefix pattern from the variable's value | Bash Scripting

Bash Scripting - String Operations

What does the Bash expression ${var#pattern} do?

ARemoves the shortest matching prefix pattern from the variable's value

BRemoves the longest matching suffix pattern from the variable's value

CRemoves the shortest matching suffix pattern from the variable's value

DRemoves the longest matching prefix pattern from the variable's value

Step-by-Step Solution

Solution:

Step 1: Understand the syntax
The syntax ${var#pattern} is used in Bash to remove a prefix pattern from the start of the variable's value.
Step 2: Identify shortest prefix removal
The single # removes the shortest matching prefix, unlike ## which removes the longest.
Final Answer:
Removes the shortest matching prefix pattern from the variable's value -> Option A
Quick Check:
Prefix removal = shortest match = A [OK]

Quick Trick: Single # removes shortest prefix, double ## removes longest [OK]

Common Mistakes:

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What does the Bash expression ${var#pattern} do?