Add sed support

[gunta]

Since sed is such a common command, it would be nice to have a cross-platform command for that.

[nichtich]

Could you explain with an example and references?

[gunta]

Shelljs has a nice sample of it working here
It is such a common case that it's even featured as the first sample.

Something like this would work:

await sed('-i', /^.*REMOVE_THIS_LINE.*$/, '', "file.txt")

[nichtich]

I don't see why sed is more relevant than e.g. awk or perl. Why not directly use shelljs?