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Listing 1. AWK Script

#!/usr/bin/awk -f
#centre: centre lines in file(s) or stdin
#usage: centre [filenames]
BEGIN {
 linelength = 80 
 spaces = "" 
}
{
 for (i = 1; i < (linelength - length($0)) / 2; i++)
 spaces = spaces " "
 print spaces $0
}