Maybe * concatenation should be implemented for Cmd like it is for strings, 
not sure why it isn't. But you can do interpolation:

julia> a = `echo`; b = `hello`; c = `world`;
julia> `$a $b $c`
`echo hello world`
julia> run(`$a $b $c`)
hello world


On Sunday, April 26, 2015 at 8:23:47 PM UTC-7, Yakir Gagnon wrote:
>
> I'm using Julia to build a imagemagick command (for a complicated gif). 
> I'm using a for loop to build the many frames for the gif. This means I end 
> up with an Array of Cmds where the first element is some header (i.e. 
> `convert -delay 1 -size $(w)x$h xc:black -antialias`), then come the 
> frames, and last some closing stuff. 
> I wish I then could just join the commands and run it. But join doesn't 
> work on the Cmd type.
>
> How can I build a Cmd from many parts?
>
> Thanks! 
>

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