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UNIX in a Nutshell: System V Edition

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The Sed Editor
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D

[address1][,address2]D

Delete first part (up to embedded newline) of multi-line pattern space created by N command and resume editing with first command in script. If this command empties the pattern space, then a new line of input is read, as if the d had been executed.

Example

# Strip multiple blank lines, leaving only one:
/^$/{
N
/^\n$/D
}


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