Sed variable replacement

Generally, the syntax for sed replacement isSed's/ABC/XYZ/G' S indicates search, G indicates replacement of gloabl, ABC indicates the replacement character, XYZ indicates the replacement character, and both sides are single quotes. If the variable name is involved, it should be

Sed's/ABC/'$ URL '/G'
OrSed "S/ABC/$ URL/G"

In other special cases, if the value of $ URL is http: // 1.2.3.4: 8080/test/hi.html, it involves/Or #, for example, it should beSed
'S # ABC # '$ URL '# G'

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