Re: Conditional operator in Shell Arithmetic section

[alex xmb ratchev]

On Sat, Mar 18, 2023, 9:30 PM uzibalqa <uzibalqa@proton.me> wrote:

>
> ------- Original Message -------
> On Sunday, March 19th, 2023 at 7:41 AM, Lawrence Velázquez <vq@larryv.me>
> wrote:
>
>
> > On Sat, Mar 18, 2023, at 1:59 PM, uzibalqa wrote:
> >
> > > Have been reading the manual about the arithmetic conditional operation
> > > described by
> > >
> > > expr ? expr : exp
> > >
> > > This is quite difficult to understand exactly how to use it.
> >
> >
> > I'm sure there are ample C examples out there.
>
> This is how it is described in the Awk Manual
>

dude what u say , this is bash list , not awk / gawk

about awk

printf %s\\n 1 2 3 |
awk '{ print $1 == 2 ? 222 : $1 }'

selector ? if-true-exp : if-false-exp
>
> Which is much more informative.
>
>
> > > For instance, consider setting the variable opst to 0 when the length
> > > of delim in positive in a bash script. One would use
> > >
> > > opst=$(( ${#delim} > 0 ? 0 : 1 ))
> >
> >
> > Or:
> >
> > if [[ -n $delim ]]; then
> > opst=0
> > else
> > opst=1
> > fi
> >
> > or:
> >
> > [[ -n $delim ]]
> > opst=$?
> >
> > or:
> >
> > opst=$((${#delim} < 1))
> >
> > or:
> >
> > opst=$((! ${#delim}))
> >
> > As Greg said, if you don't understand the operator, don't use it.
> > You have other options.
> >
> > > There needs to be at least one example of actual use in a typical
> > > situation.
> >
> >
> > No, there doesn't.
>
> There is need if you actually want to help readers.  The awk maintainers
> certainly understood the need for an actual use case (getting the absolute
> value of x).
>
> > > I also suggest to include it in section "3.2.5.2
> > > Conditional Constructs".
> >
> >
> > It's already in Section 6.5. It does not belong in 3.2.5.2.
>
> If you look at the Awk Manual, some maintainers are surely convinced that
> in belrongs in "6.3.4 Conditional Expressions".
>
> > > Specifying conditional operator "expr ? expr : exp" simply as Shell
> > > Arithmetic makes it very difficult to find in the manual.
> >
> >
> > The index could be a little more comprehensive, I guess.
>
> Would appreciate ways that are more likely to locate it.  It is widely
> known under the term Ternary Conditional often indexed with  ?:
>
> So I could not search with that.  It would be good to include.
>
> > --
> > vq
>
>