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Task: Extract Substring in Bash

Task: Extract Substring in Bash: a task in Terminal-Lego-15k (Harbor dataset). Create a bash script that extracts a substring from a given string. The script should mimic the functionality of the substr() function found in most programming languages.

The task

Create a bash script that extracts a substring from a given string. The script should mimic the functionality of the `substr()` function found in most programming languages.

Part of PrimeIntellect/Terminal-Lego-15k.