stream editor

I see many examples and man pages on how to do operations like search-and-replace using sed. But, I want to match a given string or a regular pattern expression and display on the screen. How do I print lines with matching pattern using sed command only under Unix like operating systems?

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Q. How do I find the text between the strings FOO and BAR inclusive using sed command line option?

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Q. I need to delete all empty lines but could not figure out sed command for the same? How do I delete all empty lines with sed? A. sed is a stream editor and perfect for these kind of work. You need to use d command under sed which is act as the delete function. […]

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How do I remove all spaces from string using shell scripts? I’ve var=”This is a test”, and I’d like to remove all spaces.

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