Re: Another potential ksh bug?
Hi Vadim,
Thanks for looking into this, all I ever wanted was an ancient pdksh bug
fix for Christmas.
Regards,
Jordan
On 12/7/20 10:47 AM, Vadim Zhukov wrote:
For me, this is a definite bug. I've opted my students to fix this
bug, so unless there's a hurry, there must be a fix till the end of
December. :)
пн, 7 дек. 2020 г. в 07:43, Jordan Geoghegan :
Hello again,
I was playing around with ksh array syntax and its behaviour when set as
read-only. In my testing I noticed that ksh will allow you to overwrite
the first element of a read-only array. Example snippet:
#!/bin/ksh
arr[0]=val1
arr[1]=val2
readonly arr
echo "${arr[@]}"
arr=yikes
echo "${arr[@]}"
I tested a few other shells, and this bug does exists in the original
pdksh and is also present in zsh. This bug is not present in ksh93, mksh
or bash, where they abort when trying to modify the read-only array.
I don't have access to a proper ksh88 shell, but it would be nice if
someone could confirm its behaviour.
I was just hoping someone could confirm if this is intended behaviour,
or if it's a bug.
Regards,
Jordan
Re: Another potential ksh bug?
On 12/7/20 10:14 PM, Noth wrote:
On 07/12/2020 05:41, Jordan Geoghegan wrote:
Hello again,
I was playing around with ksh array syntax and its behaviour when set
as read-only. In my testing I noticed that ksh will allow you to
overwrite the first element of a read-only array. Example snippet:
#!/bin/ksh
arr[0]=val1
arr[1]=val2
readonly arr
echo "${arr[@]}"
arr=yikes
echo "${arr[@]}"
I tested a few other shells, and this bug does exists in the original
pdksh and is also present in zsh. This bug is not present in ksh93,
mksh or bash, where they abort when trying to modify the read-only
array.
I don't have access to a proper ksh88 shell, but it would be nice if
someone could confirm its behaviour.
I was just hoping someone could confirm if this is intended
behaviour, or if it's a bug.
Regards,
Jordan
Hi,
I tries this with AMIX (UNIX SVR4 for Commodore Amiga) v2.1 which
presumably is using ksh88 as it hasn't been updated since circa 1992
and it does abort at the same place. Screenshot here:
http://casper.nineinchnetworks.ch/images/kshtest.png .
Cheers,
Noth
Hi Noth,
Sorry for the late reply, I've been AFK for several days.
Thanks for testing that out and confirming ksh88's behaviour!
Regards,
Jordan
Re: Another potential ksh bug?
On 07/12/2020 05:41, Jordan Geoghegan wrote:
Hello again,
I was playing around with ksh array syntax and its behaviour when set
as read-only. In my testing I noticed that ksh will allow you to
overwrite the first element of a read-only array. Example snippet:
#!/bin/ksh
arr[0]=val1
arr[1]=val2
readonly arr
echo "${arr[@]}"
arr=yikes
echo "${arr[@]}"
I tested a few other shells, and this bug does exists in the original
pdksh and is also present in zsh. This bug is not present in ksh93,
mksh or bash, where they abort when trying to modify the read-only array.
I don't have access to a proper ksh88 shell, but it would be nice if
someone could confirm its behaviour.
I was just hoping someone could confirm if this is intended behaviour,
or if it's a bug.
Regards,
Jordan
Hi,
I tries this with AMIX (UNIX SVR4 for Commodore Amiga) v2.1 which
presumably is using ksh88 as it hasn't been updated since circa 1992 and
it does abort at the same place. Screenshot here:
http://casper.nineinchnetworks.ch/images/kshtest.png .
Cheers,
Noth
Re: Another potential ksh bug?
For me, this is a definite bug. I've opted my students to fix this
bug, so unless there's a hurry, there must be a fix till the end of
December. :)
пн, 7 дек. 2020 г. в 07:43, Jordan Geoghegan :
>
> Hello again,
>
> I was playing around with ksh array syntax and its behaviour when set as
> read-only. In my testing I noticed that ksh will allow you to overwrite
> the first element of a read-only array. Example snippet:
>
> #!/bin/ksh
> arr[0]=val1
> arr[1]=val2
> readonly arr
> echo "${arr[@]}"
> arr=yikes
> echo "${arr[@]}"
>
> I tested a few other shells, and this bug does exists in the original
> pdksh and is also present in zsh. This bug is not present in ksh93, mksh
> or bash, where they abort when trying to modify the read-only array.
>
> I don't have access to a proper ksh88 shell, but it would be nice if
> someone could confirm its behaviour.
>
> I was just hoping someone could confirm if this is intended behaviour,
> or if it's a bug.
>
> Regards,
>
> Jordan
>
--
WBR,
Vadim Zhukov
Another potential ksh bug?
Hello again,
I was playing around with ksh array syntax and its behaviour when set as
read-only. In my testing I noticed that ksh will allow you to overwrite
the first element of a read-only array. Example snippet:
#!/bin/ksh
arr[0]=val1
arr[1]=val2
readonly arr
echo "${arr[@]}"
arr=yikes
echo "${arr[@]}"
I tested a few other shells, and this bug does exists in the original
pdksh and is also present in zsh. This bug is not present in ksh93, mksh
or bash, where they abort when trying to modify the read-only array.
I don't have access to a proper ksh88 shell, but it would be nice if
someone could confirm its behaviour.
I was just hoping someone could confirm if this is intended behaviour,
or if it's a bug.
Regards,
Jordan
