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I'm aware that this is a really simple question, but I'm struggling to find a solution to this .

I need to automatically find and replace in the /etc/aliases file the following section:

# Person who should get root's mail
#root:   marc

And it needs to look something like:

# Person who should get root's mail
root:  someone@something.tld

And I haven't been able to find a solution. Can you guys jump in with some suggestions? Doesn't need to be sed.

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On a GNU system, you can use this:

sed -i '/^#[[:blank:]]Person/{n;s/#root:[[:blank:]]\+marc/root:\tsomeone@something.tld/;}' file

It searches for a line beginning with # Person. Then switches to the next line and replaces #root:<blanks>marc with root:<tab> .... The -i flag edits the file inplace.

-i, \+ and \t are GNU extensions. The standard equivalent of \+ is the wordier \{1,\}. To edit the file in place portably, you'd need to resort to a temporary file. The standard equivalent of \t is to insert a tab character literally.

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