R: Portable Cygwin: replacing drivename in a text file

[Marco Atzeri]

--- Mer 24/11/10, Fergus ha scritto:

> Running Cygwin off a portable USB
> stick.
> 
> Different host machines typically allocate a different
> drivename to the stick.
> 
> Previous use, say it was J:. A not-quite-portable
> application needed a settings.ini file built with many
> occurrences of the string j:\usr\local\bin. The file was
> built and saved.
> 
> Current use: now it's K:.
> 
> I could re-configure settings.ini with
> sed -i 's/j:/k:/g' settings.ini
> but in general I don't know (and don't want to bother with)
> what the drivename labels were, or are. Something like
> sed -i 's/.:\\/ replacementstring /g' settings.ini
> will in fact be sufficiently strong to make the change
> olddriveletter: to newdriveletter: where, and only where, I
> need it, but experiment as I might with
> replacementstring = cygpath -w
> replacementstring = `cygpath -w`
> and other variations, I can't get the syntax quite right.
> 
> Can anybody help, please? Thank you very much.
> 
> Fergus

something like this ?

a=$(cygpath -w /)

$ echo $a
E:\cygwin2






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