[gentoo-user] [OT] Bash scripting 2

[gentoo-user] [OT] Bash scripting 2

[Peper]

Hello,
How can i check whether i can create or overwrite a file?

For example:
If /etc/conf.d/net cannot be overwritten or created it return false.

Overwriting test would be -w /etc/conf.d/net, but how can i check if i can 
create this file? I could check whether i can create new files 
in /etc/conf.d, but how can i get /etc/conf.d/ from /etc/conf.d/net ?

-- 
Best Regards,
Peper
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gentoo-user@gentoo.org mailing list

Re: [gentoo-user] [OT] Bash scripting 2

[Peter De Zutter]

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Hi,
you can check if the directory containing the file is writable, if it isn't
then you can't create a file.
Greetz
Peter


On 11/11/05, Peper <peper@aster.pl> wrote:
>
> Hello,
> How can i check whether i can create or overwrite a file?
>
> For example:
> If /etc/conf.d/net cannot be overwritten or created it return false.
>
> Overwriting test would be -w /etc/conf.d/net, but how can i check if i can
> create this file? I could check whether i can create new files
> in /etc/conf.d, but how can i get /etc/conf.d/ from /etc/conf.d/net ?
>
> --
> Best Regards,
> Peper
> --
> gentoo-user@gentoo.org mailing list
>
>


--
I have plenty of common sense,
I just choose to ignore it.
--- Calvin

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Re: [gentoo-user] [OT] Bash scripting 2

[Renat Golubchyk]

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On Fri, 11 Nov 2005 18:57:40 +0100 Peper <peper@aster.pl> wrote:
> Hello,
> How can i check whether i can create or overwrite a file?
> 
> For example:
> If /etc/conf.d/net cannot be overwritten or created it return false.
> 
> Overwriting test would be -w /etc/conf.d/net, but how can i check if
> i can create this file? I could check whether i can create new files 
> in /etc/conf.d, but how can i get /etc/conf.d/ from /etc/conf.d/net ?

$ dirname /etc/conf.d/net
/etc/conf.d


Cheers,
Renat

-- 
Probleme kann man niemals mit derselben Denkweise loesen,
durch die sie entstanden sind.
                                              (Einstein)

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[gentoo-user] Re: [OT] Bash scripting 2

[Peper]

> $ dirname /etc/conf.d/net
> /etc/conf.d
That's what i need, many thanks!

-- 
Best Regards,
Peper
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] [OT] Bash scripting 2

[Alexander Skwar]

Peper schrieb:
> Hello,
> How can i check whether i can create or overwrite a file?

You need write access on the directory for creating files and
on the file for overwriting.

> For example:
> If /etc/conf.d/net cannot be overwritten or created it return false.

Use "test" or "[" or "[[".

> Overwriting test would be -w /etc/conf.d/net,

Yep.

> but how can i check if i can 
> create this file?

[[ -w `dirname /etc/conf.d/net` ]] && echo can create file

> I could check whether i can create new files 
> in /etc/conf.d,

Yep.

> but how can i get /etc/conf.d/ from /etc/conf.d/net ?

dirname. Or if you've got that in an environment variable,
you use "Parameter Expansion".

file=/etc/conf.d/net
echo ${file%/*}

Alexander Skwar
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gentoo-user@gentoo.org mailing list

[gentoo-user] Re: [OT] Bash scripting 2

[Peper]

> file=/etc/conf.d/net
> echo ${file%/*}
I've gotten it working with dirname already, but this one is nice ;] Thanks 
for help.

-- 
Best Regards,
Peper
-- 
gentoo-user@gentoo.org mailing list