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1# Sed script that inserts the file called HEADER before the header entry.
2#
3# At each occurrence of a line starting with "msgid ", we execute the following
4# commands. At the first occurrence, insert the file. At the following
5# occurrences, do nothing. The distinction between the first and the following
6# occurrences is achieved by looking at the hold space.
7/^msgid /{
8x
9# Test if the hold space is empty.
10s/m/m/
11ta
12# Yes it was empty. First occurrence. Read the file.
13r HEADER
14# Output the file's contents by reading the next line. But don't lose the
15# current line while doing this.
16g
17N
18bb
19:a
20# The hold space was nonempty. Following occurrences. Do nothing.
21x
22:b
23}
24