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Linux in a Nutshell, 6th Edition by Robert Love, Stephen Figgins, Ellen Siever, Arnold Robbins

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Name

#

Synopsis

#

Begin a comment in a sed script. Valid only as the first character of the first line. (Some versions, including GNU sed, allow comments anywhere, but it is better not to rely on this.) If the first line of the script is #n, sed behaves as if -n had been specified.

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