Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > gnu.bash.bug > #16674

Re: set -u not working as expected

Show key headers only | View raw

> On Aug 2, 2020, at 2:51 AM, Oğuz <oguzismailuysal@gmail.com> wrote:
> 
> `u' has no members, so there's nothing to expand. If you use `${u[0]}' for
> example, you'll see an error, I think how bash and ksh behave is perfectly
> reasonable.

Agreed. Their behavior logically follows from POSIX's carveout for $@.

>> % bash -c 'set -u; typeset -i v; printf "<%s>\\n" "$v"'
>> bash: v: unbound variable
>> % ksh -c 'set -u; typeset -i v; printf "<%s>\\n" "$v"'
>> ksh: v: parameter not set
>> % zsh -c 'set -u; typeset -i v; printf "<%s>\\n" "$v"'
>> <0>
>> 
>> 
> `typeset -i v' doesn't assign `v', just gives it the integer attribute.
> Again, I can't see any problem with bash and ksh here.

Also agreed, but I was more interested in the next part...

>> % bash -c 'set -u; typeset -i v; v+=1; printf "<%s>\\n" "$v"'
>> <1>
>> % ksh -c 'set -u; typeset -i v; v+=1; printf "<%s>\\n" "$v"'
>> <1>
>> % zsh -c 'set -u; typeset -i v; v+=1; printf "<%s>\\n" "$v"'
>> <1>

...which contrasts with the behavior of let. Someone else will have
to explain this, as I don't know what to make of it.

vq

Back to gnu.bash.bug | Previous | Next | Find similar

Thread

Re: set -u not working as expected Lawrence Velázquez <vq@larryv.me> - 2020-08-02 03:34 -0400

csiph-web