[OT] Need some bash scripting assistance

[James Wellnitz]

Something like this will basically do the "increment target link" part
(making some big assumptions, doing no error checking, not handling
wrap-around, etc.):

cur_link=$(readlink target | sed -e "s#./##")
cur_number=${cur_link%% *}
cur_number=${cur_number#0}
let new_number=cur_number+1
new_number=$(printf "%02d" $new_number)
new_link=$(find . -name "${new_number} *")
ln -sf "${new_link}" target

Dealing with the leading '0' (zero) accounts for some of odd parts
(e.g. the printf).

On Thu, Jun 10, 2010 at 12:23 PM, Dale J. Chatham <dale at chatham.org> wrote:
>
> Just to nail the point home, if you have spaces in the name, you must
> put quotes around the name of the variable containing the name.
>
> Or:
>
> FILE="a b c.txt"
>
> cat "$FILE"
>
> cat "a b c.txt"
>
> If it has things like "?", "*", or others, Danger Will Robinson!!
>
> On 06/10/2010 11:14 AM, Roberto Ragusa wrote:
>>
>> If it is the "rotation" part you want help on, I can give you some
>> suggestions.
>>
>> You find the name of the linked file with
>>    find target -printf "%l\n"
>>
>> You find the new destination for target with
>>    ls|grep -A1 "$oldtarget"|tail -1
>>
>> The end-of-list condition can be handled with an additional dummy
>> file and then an explicit if [ "$newtarget" == "ZZZ_after_the_last" ]
>> approach. Or you can use a trick like "(ls;ls)|grep -A1 ...".
>>
>> Is that enough for you to go on?
>>
>> Take care of the strange characters in filenames, as others have rightly
>> pointed out.
>>
>>
>
>
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