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po/insert-header.sin

 

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# Sed script that inserts the file called HEADER before the header entry.

 

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#

 

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# At each occurrence of a line starting with "msgid ", we execute the following

 

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# commands. At the first occurrence, insert the file. At the following

 

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# occurrences, do nothing. The distinction between the first and the following

 

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# occurrences is achieved by looking at the hold space.

 

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/^msgid /{

 

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x

 

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# Test if the hold space is empty.

 

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s/m/m/

 

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ta

 

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# Yes it was empty. First occurrence. Read the file.

 

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r HEADER

 

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# Output the file's contents by reading the next line. But don't lose the

 

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# current line while doing this.

 

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g

 

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N

 

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bb

 

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:a

 

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# The hold space was nonempty. Following occurrences. Do nothing.

 

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x

 

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:b

 

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}

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