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Write a command to locate all lines in bashrc that have [ and ] in them...

Write a command to locate all lines in bashrc that have [ and ] in them (meaning, find all brackets that

may have zero or more characters between them). For this, you want to locate a [, any character(s)

and a ]. Remember that “any character” is found with . and to locate any number of them, you would

use .* To locate [ and ], you have to escape the metacharacter, much as you did in 5.

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Answer #1 
grep '\[.*]' file.txt

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