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Comment by chris_wot | Hacker News Reader

What does :v do?

:help :v will tell you:

:[range]v[global]/{pattern}/[cmd] Same as :g!.

Where:

:[range]g[lobal]!/{pattern}/[cmd] Execute the Ex command [cmd] (default ":p") on the lines within [range] where {pattern} does NOT match.

So :v/error/d will delete all lines that don't contain the string "error".

Which neatly maps to grep's -v option that does the same.

I always thought "-v" meant "verbose" traditionally in Unix command line options.

No tradition without exceptions.

Oh! I've been messing about with a bit of splitting up of C++ classes into seperate headers as a bit of a test and I recently did a:

  sed -i "/#include <vcl\/button\.hxx>/d" $(git grep -l "vcl\/button\.hxx" *.hxx | grep -v precompiled)

Knowing about a :v might have been helpful...

It's the same as :g!/error/d I believe