Re: shell equivalent to text 1 thru -9?
Re: shell equivalent to text 1 thru -9?
- Subject: Re: shell equivalent to text 1 thru -9?
- From: Martin Orpen <email@hidden>
- Date: Wed, 20 Apr 2005 00:21:37 +0100
on 19/4/05 23:54, Christopher Nebel at email@hidden wrote:
> On Apr 19, 2005, at 6:40 AM, Chris Janton wrote:
>
>>> The shell can't easily do string extraction by position, but it
>>> can certainly do it by matching and removing a known prefix or
>>> suffix.
>>>
>>> x="nameOfSomeApp_log.txt"
>>
>> Sure it can (bash in this example) it just needs to be specified
>> properly.
>>
>> To get the length of a string - ${#x}
>> To get everything but the last 8 characters - ${x: 0: ${#x}-8}
>>
>> That's STRING : offset : number of characters
>
> I find cut(1) to be very useful for this sort of thing, though it
> can't handle this particular case, since it has no way to specify
> positions relative to the end of the line.
But, in the example given by the OP, cut gets the job done:
echo 'nameOfSomeApp_log.txt' | cut -d _ -f1
Guess it depends on whether the names are more likely to vary in delimiter
or length :(
--
Martin Orpen
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