Bash has a series of Shell Parameter Expansion features that allow you to do a number of different things when working with your shell. One of those features makes it possible to get the number of characters in a string easily.

For example this stores “Hello World” into myvariable and then writes 11 to the screen (the number of characters in the string).

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myvariable="Hello World"
echo "${#myvariable}"

You can read more about Bash’s features and Shell Parameter Expansion specifically in the Bash docs: https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Shell-Parameter-Expansion

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