Sed?comments are lines where the first non-white character is a "#." On many systems,?sed?can have only one comment,and it must be the first line of the script. On the Sun (1988 when I wrote this),you can have several comment lines anywhere in the script. Modern versions of Sed support this. If the first line contains exactly "#n" then this does the same thing as the "-n" option: turning off printing by default. This could not done with a?sed?interpreter script,because the first line must start with "#!/bin/sed -f" as I think "#!/bin/sed -nf" generated an error. It works as I write this update in 2008. Note that "#!/bin/sed -fn" does not work because sed thinks the filename of the script is "n". However,

"#!/bin/sed -nf" 

does work.

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