Re: [Devil-linux-develop] upgrade-config

[Friedrich L. <fl...@fl...>]

Heiko Zuerker wrote on 01.02.2004 16:50 MET:
> Friedrich Lobenstock wrote:
> 
>> Bruce Smith wrote on 01.02.2004 03:23 MET:
>>
>>> The grep example is the cleanest bash code, but what about performance?
>>> The upgrade-config script is already a little slow, and I'm more
>>> concerned about speed than how it looks.
>>>
>>> (my guess is still grep, but I'd like hear other thoughts)
>>
>> I think you could try the following (filelist.txt becomes selectlist):
>>
>> # build candidate list (a list of all available files)
>> ....... >> /tmp/candidates
>>
>> # calculate intersection of candidate list with select list
>> TO_SELECT=$(sort /tmp/candidates selectlist | uniq -d)
>>
>> for SELECT in $TO_SELECT; do
>>     # cycle through all the files that should be selected per default
>>         ...set variables...
>> done
>>
>> "uniq -d" gives you those lines of both files that are equal,
>> so you will get exactly a list of file that exist in the current
>> config which should be selected per default.
> 
> 
> I blame it on the early time, but I'm confused now....
> 
> Anyhow, you also need to check the filedate, you can exclude all the 
> 1980 ones. This should further reduce possible errors.

Ok, to clarify this, I thought this is clear but if you only add
the files with date > 1980 to the /tmp/candidates files the result
should be what you want.

PS: I don't have to tell you that you should run mktemp to create
a temporary file (see sample code in "man 1 mktemp") instead of
using /tmp/candidates which was just used to be descriptive.

-- 
MfG / Regards
Friedrich Lobenstock
____________________________________________________________________
Friedrich Lobenstock                       Linux Services Lobenstock
URL: http://www.lsl.at/                         Email: fl...@fl...
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