[colug-432] Regex

[Steve VanSlyck]

So I have a copy of sudoers in my home directory for purposes of messing
it up (or not).

I want to locate the line

Defaults Env_reset [unknown number of spaces in middle, zero to unknown
number of spaces at end of line]

and after that line insert a line that says

Defaults editor=/bin/nano [four spaces in middle, no spaces at
end of line]

I think $1 copies the prior group, which is identified by parens. So
what happens is that sed finds the original line, then replaces that
line with the original line plus a newline plus an additional line to
set the editor.

Does this look like a reasonably good sed/RegEx line to do that? (Point
was noted about not using i.bak yet, but this is not working on the
actual sudoers file.)

sed -i.bak 's:(^Defaults\s*Env_reset\s*)$:$1\nDefaults
editor=/bin/nano:' ./sudoers
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