[ubuntu-za] Script error
Alf Stockton
alf at stockton.co.za
Tue Apr 14 13:40:23 BST 2009
Jonathan Hitchcock wrote:
> Hi,
>
> On 14 Apr 2009, at 2:20 PM, Alf Stockton wrote:
>> #/bin/dash
>> if [ -f /mnt/backup/mailbackups/*.dotproject.files.tar.gz ]
>> then
>> rm /mnt/backup/mailbackups/*.dotproject.files.tar.gz
>> fi
>>
>> and I keep getting the error:-
>>
>> ./DingDong.sh: line 2: [: too many arguments
>
> When you have a * on a commandline, the shell replaces it with all the
> files that match that pattern. So if you have files like the following:
>
> /mnt/backup/mailbackups/foo.dotproject.files.tar.gz
> /mnt/backup/mailbackups/bar.dotproject.files.tar.gz
>
> Then the 'if' statement above will be expanded to the following:
>
> if [ -f /mnt/backup/mailbackups/foo.dotproject.files.tar.gz /mnt/
> backup/mailbackups/bar.dotproject.files.tar.gz ]
>
> This happens before the 'if' statement is evaluated. And, of course,
> the "-f" test does not take more than one filename as an argument,
> which is why you're getting the "too many arguments" error.
>
> Basically, you can't use "-f" to test for the existence of "any file
> matching this pattern". If you wanted to do that, you would have to
> do something like evaluating the pattern, storing it in a variable,
> and testing the length of the variable, or something.
>
> But it seems that all you want to do is remove any files matching that
> pattern, if they exist. If that is the case, then just replace the
> whole thing with:
>
> rm -f /mnt/backup/mailbackups/*.dotproject.files.tar.gz
>
> The '-f' means 'unconditionally', or, in other words "whether they
> exist or not".
>
>
Then I am certainly confused as the following works fine in another script.
if [ -f /mnt/backup/mailbackups/*.dotproject.backup.sql ]
then
rm /mnt/backup/mailbackups/*.dotproject.backup.sql
fi
--
Regards,
Alf Stockton www.stockton.co.za
You can create your own opportunities this week. Blackmail a senior executive.
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