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caller: add page (#15246)

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# caller
> Print function context.
> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-caller>.
- Print the line and filename where the current function was called:
`caller`
- Print the line, function and filename where the current function was called:
`caller 0`
- Print the line, the function name and the filename of a function call `n` frames back:
`caller {{n}}`