A line number is a decimal integer. As sed reads lines
from its input file, it increments a line counter. Each time
sed reads a new line it checks whether the current line
number matches any of the commands in its command list. If any of
the commands match the current line number, they are carried
out. The counter runs cumulatively through multiple input files;
thus, if sed is reading in five files, each 100 lines
long, line address 369 actually refers to the 69th line of the
fourth file. The counter is not reset when new input files are
opened. A special case is the dollar sign character ($) which
matches the last line of the last input file.
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SCO OpenServer Release 6.0.0 -- 03 June 2005