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).
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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