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The sed FAQ
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5.1. Why don't my variables like $var get expanded in my sed script?

Because your sed script uses 'single quotes' instead of "double quotes." Unix shells never expand $variables in single quotes.

This is probably the most frequently-asked sed question. For more info on using variables, see section 4.30.

The sed FAQ
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   Reprinted courtesy of Eric Pement. Also available at https://sed.sourceforge.net/sedfaq.html Design by Interspire