Re: sed "Hello, world!" program?

On 2014-02-23 17:52, [email protected] wrote:
> So here is an alternate suggestion for the sed "Hello, world!"
> example for group members to consider:
> 
> ------------------------------
> # convert input text stream to "Hello, world!"
> s/.*/Hello, world!/
> q
> ------------------------------
> 
> sed is really two things in one: 1) the command-line utility. 2)
> the simple scripting language that the sed utility reads. By
> separating out the script from the command line environment, this
> example is immune (I think) to command line oddities like the C
> shell behavior and differences in sed versions.
> 
> So is this the best "Hello, world!" example? Or is there some other
> defect lurking, or some better way?

I think this is my favorite so far. It should be cross-platform with
the following benefits:

- no trouble escaping the "!"

- no trouble with single-vs-double quotes

- no need for a specific external utility (though "echo" still has
  fairly broad support) as long as you have *something* that produces
  output on stdout, including any arbitrary text file

- no dependency on redirecting-stderr notation

- demonstrates that sed scripts can be external files, not just the
  command command-line usage

- demonstrates use of the archetypal s/// command

So I'm +1 on this.

-tkc