list files ignoring the case option
On Thu, 4 Nov 2004, Adaikalavan Ramasamy wrote:
Sorry if this is a question more on regular expressions. I am dealing with several files which have been badly named. For example the files are given either the extensions txt, TXT or Txt. I wish to select all those files ending with 'txt' ignoring case. Here is how I would do it in bash (Redhat FC2) : touch a1.txt a2.TXT a3.Txt txt.control TXT.control ls -1 | grep -i "txt$" Here is how I am currently doing it in R a <- list.files(all.files=T) grep( "txt$", a, ignore.case=T, value=T )
I'd write that in one line, but it seems as good a way as any.
Is it possible for me to modify the following line to include ignore case option ? a <- list.files( pattern="txt$" )
Not as such.
First, I think you want "\\.txt$" there if you do mean file extensions.
You can use a regexp that ignores case, though, e.g. "\\.[Tt]{Xx][Tt]".
But I would just use your original idea, which is essentially what ls() is
doing internally and is self-documenting.
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595