On Mon, 28 Nov 2022 at 00:01, Alejandro Colomar <[email protected]> wrote:
> On 11/27/22 12:41, Alexey wrote:
> > On 2022-11-26 21:45, Alejandro Colomar wrote:
> > I could suggest you to use for clarity another construction:
> > [[ ${1+isset} ]] || echo "not set"
> > Here "isset" is just for readability. You could place any other string
> > literal
> > there.
> I actually find that very confusing. What feature is it using? I couldn't
> find
> it with `info bash | less` then `/\+`.
See:
https://www.gnu.org/software/bash/manual/bash.html#Shell-Parameter-Expansion
- Under heading: ${parameter:+word}
- The parameter is 1
- The word is isset
- The colon ':' is optional, explained by the sentences beginning with
"Omitting the colon" ..
