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