[arch-general] Unzip archive in which are multiple sub zip archiers?

Csányi Pál csanyipal at gmail.com
Mon Apr 20 12:27:12 UTC 2015

2015-04-17 23:38 GMT+02:00 Maarten de Vries <maarten at de-vri.es>:
> On 04/17/2015 10:57 PM, Christian Demsar wrote:
>> I'll try to use the globbing. That's new to me.
>> Is there anything else you saw that was odd? This is the first non-trivial
>> script I've written (recursion in bash!), so I'm not sure about the
>> placement of the functions, etc.
> At a second look, this check might also be a problem:
> if [ $zipFiles ]; then
> To be honest I'm not sure what bash will do with that when $zipFiles is an
> array. The check isn't really needed with an array since looping over an
> empty array won't do anything anyway. When you do need it you can get the
> number of elements in an array in bash with ${#array[@]} and test on that.
> Knowing how bash arrays work can be very useful in writing effective bash
> scripts. If you haven't yet I would recommend reading up on their specifics.
> In bash (and some other shells), you might also prefer [[ ]] for tests over
> [ ]. It is somewhat less confusing in some situations, but be aware that it
> is not POSIX. Then again, arrays aren't POSIX either. Just be sure to use a
> proper bash shebang and not #!/bin/sh when you're using bash features (you
> already did this, but it's important so I'm emphasizing ;) ).
> I also saw that you check for read permissions before trying to extract the
> zip file. It doesn't hurt, but it's generally better to just try doing what
> you want to do and detect errors by checking the exit code of programs you
> run. Otherwise you will likely forget to check for some uncommon error
> conditions. In some cases it can even happen that the error conditions are
> not present when you test for them, but they are later when you try to
> extract the file (or do something else with it) because something or someone
> changed something in between.
>> Is there a way to declare the functions like in C? I couldn't figure that
>> out from the section on functions in Advanced Bash Scripting.
> If you mean first declare a function and define it later: no, you can't do
> that in bash. On the other hand, you can use a function B the body of
> function A before B is defined, as long as you don't call A until B is
> defined. So in general it doesn't really matter. For example, this will work
> fine:
>    foo() {
>         bar
>    }
>    bar() {
>         echo "Hello world!"
>    }
>    foo
> I hope my comments are useful. If not, feel free to ignore them ;)
> Regards,
> Maarten

Thank you all for help.
The script works, it can unzip archives recursively.

Regards from Pal

More information about the arch-general mailing list