On 07/10/2016 09:33 AM, Philip Guenther wrote:
[...]
I just ran the line where _dkdev is set and when using the resulting value
with e.g. `echo` it looks like the "??" is expanded by the shell if $_dkdev
is not enclosed in double quotes. This also seems to happen for the test
clause:
Yeah, that's one of the reasons to use [[ ... ]] instead of [ .. ].
I see, didn't know that difference between [ and [[ yet. I mostly use
bash and quote string operands in [[ clauses anyhow. Bash's man page is
not that clear in this respect compared to pdksh's man page, which
explicitly says:
```
[...]
[[ expression ]]
Similar to the test and [ ... ] commands (described later), with
the following exceptions:
* Field splitting and file name generation are not performed on
arguments.
[...]
```
...as I just found out.
# [ $_dkdev == '??' ]
ksh: [: /dev/pf: unexpected operator/operand
Try:
[[ $_dkdev == '??' ]]
Note the '??' must remain quoted so that they *aren't* a globbing
pattern for [[ .. ]]'s more powerful == operator...
Agreed, this gives an identical result to using [ and quoting $_dkdev.
But for the patch to `/etc/rc` don't forget to add "/dev/" in front of
"??" ('??' => '/dev/??'), so the test actually works.
Bye
Frank
