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sed search and replace

How do you find and replace in SED? Does SED change the original file?

sed search and replace
How do you find and replace in SED?

The s command (as in substitute) is probably the most important in sed and has a ... affect the x character that is added to pattern space when replacing b- with xB . ... to the normal behavior) the empty string after a newline, and the empty stringĀ ...