Linux expr command tutorial for beginners (with examples)

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Linux expr command tutorial for beginners (with examples)
Sometimes, while working on the command line (especially when dealing with a shell script), you may find yourself in a situation where you have to perform actions like searching for a substring in a string, finding its index, as well as other things like performing comparisons and arithmetic operations. For those who aren’t in the know, there exists a command line utility – dubbed expr – that lets you do all this.

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