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help please: apply REGEX to multiple lines?

Link to this post 02 Jan 11

hi friends! happy new year!
i never manage to do a regex includeing multiple lines, does anyone has an idea about that?

imagin you have a file

a
b
c

and you want to turn it into just

b

but without useing grep next line/line before
it needs to be something like:
sed -i "s#a\n(b\n)c\n#$1#g" file (which does not work)

thanks a lot

Link to this post 12 Jan 11

why not cat or grep ?
grep with regexp are easy ? is there a reason to avoid it ?

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