Check If a String Contains a Substring in Bash

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You can use this to solve a number of real business use cases.

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0:00 -- Intro
0:33 -- Solving a real business use case
2:18 -- Looking at the script
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I did this once or twice for onboarding solution, using arrays. Actually I've done it with grep as well, which is simpler than this.

ayex
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Can't we use the =~ operator instead?

farzadmf