Programatically finding value of "cygdrive" prefix

[Ken Dibble]

Christopher Faylor wrote:

>On Wed, Aug 10, 2005 at 02:00:18PM -0500, Ken Dibble wrote:
>  
>
>>Christopher Faylor wrote:
>>
>>    
>>
>>>On Wed, Aug 10, 2005 at 02:36:16PM -0400, Christopher Faylor wrote:
>>>
>>>
>>>      
>>>
>>>>On Wed, Aug 10, 2005 at 11:23:00AM -0700, Linda W wrote:
>>>>  
>>>>
>>>>        
>>>>
>>>>>Is there a way to find out in a bash script the cygdrive prefix?
>>>>>I thought something simple like
>>>>>mount -p|tail -1|cut -f1
>>>>>but that incorrectly assumed the fields were tab delimited.
>>>>>Since there can be spaces in the cygdrive prefix, I can't
>>>>>use space a delimiter, example:
>>>>># mount -p
>>>>>Prefix              Type         Flags
>>>>>/cyg drive posix path  system       binmode
>>>>>----
>>>>>    
>>>>>
>>>>>          
>>>>>
>>>>There may be a simpler way to do it, but this seems to work:
>>>>
>>>>mount -p | sed -n '2s/\([^ ]\)  *[^ ][^ ]*  *[^ ][^ ]*$/\1/p'
>>>>  
>>>>
>>>>        
>>>>
>>>This is shorter:
>>>
>>>mount -p | sed -nr '2s/([^ ]) +\S+ +\S+$/\1/p'
>>>
>>>      
>>>
>>Or you can do it the long, slow wasteful way, which us dullards are required
>>to use, so we can figure out why it broke yet again.
>>
>>#!/bin/bash
>>let c=0;
>># get the number of fields
>>for i in `mount -p | tail -1`; do let c=$c+1; done
>>
>># if number of fields is greater than 3 because mount point has a space, 
>>add them
>>CUT_FIELDS="--fields=1"
>>let i=3;
>>while [ $i -lt $c ]
>>do
>>CUT_FIELDS=$CUT_FIELDS,$i
>>let i=$i+1
>>done
>>
>># get the fields
>>mount -p | tail -1 | /usr/bin/cut --delimiter=" " $CUT_FIELDS
>>    
>>
>
>Personally, if something breaks, I'd rather look at one line than
>eighteen.  I can't imagine why anyone would find the above an acceptable
>solution when it's possible to do it all with one line.  And, the above
>doesn't handle imbedded spaces.
>
>Btw, a further simplification:
>
>mount -p | sed -nr '2s/(\S) +\S+ +\S+$/\1/p'
>
>cgf
>  
>
You are right, the shell script that I wrote does not address the issue 
it was intended for.
I apologize for any inconvienence this caused anyone.
As well, I apologize for not spending enought time using sed for your 
sed scripts to mean anything to me.
Ken


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