Hi,
There must be an easy way to do this, but I'm not finding it..
I'd just like to know the syntax to move up and down folder levels, without
necessarily entering a full file path. Also, how to construct file and folder
paths using variables.
For example 1, if I wanted to print to the screen the contents of a file called
myFile.txt using the bash shell, I'd use the following:
cat ../myFile.txt
Also, for example 2, if I want to cd into a folder that contains my files, from
within a loop, where the counter serves as one of the folders in the path.
In bash:
for i in {1..5} A B C # A, B, and C are also folder names
do
cd ~/${i} # move into (change working directory to?) my folder of interest,
which is 1,2,3,4,5,A,B,or C
cat myFile.txt # print corresponding file of interest to screen
cd - # move back to the previous folder
done
I wonder if there's an easy corresponding way to accomplish this in R.
Any ideas most welcome!
Jonathan
On 11-06-08 5:35 PM, J wrote:> Hi, > There must be an easy way to do this, but I'm not finding it.. > > I'd just like to know the syntax to move up and down folder levels, without necessarily entering a full file path. Also, how to construct file and folder paths using variables. > > For example 1, if I wanted to print to the screen the contents of a file called myFile.txt using the bash shell, I'd use the following: > > cat ../myFile.txt > > Also, for example 2, if I want to cd into a folder that contains my files, from within a loop, where the counter serves as one of the folders in the path. > > In bash: > > for i in {1..5} A B C # A, B, and C are also folder names > do > cd ~/${i} # move into (change working directory to?) my folder of interest, which is 1,2,3,4,5,A,B,or C > cat myFile.txt # print corresponding file of interest to screen > cd - # move back to the previous folder > done > > > I wonder if there's an easy corresponding way to accomplish this in R.The .. notation is supported on all platforms, as far as I know. So to go to the parent of the current working dir, just use setwd("..") The ~ notation is not supported in all R functions, but setwd() supports it on all platforms, as far as I know. Use file.path() to construct longer paths. For your second example it would simply be setwd(file.path("~", i)). Duncan Murdoch> > Any ideas most welcome! > > Jonathan > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.
Try this:
lapply(dir("myPathDir", recursive = TRUE, pattern =
"myFile.txt$",
full.names = TRUE), readLines, warn = FALSE)
On Wed, Jun 8, 2011 at 6:35 PM, J <jonsleepy at gmail.com>
wrote:> Hi,
> ? There must be an easy way to do this, but I'm not finding it..
>
> I'd just like to know the syntax to move up and down folder levels,
without necessarily entering a full file path. ?Also, how to construct file and
folder paths using variables.
>
> For example 1, if I wanted to print to the screen the contents of a file
called myFile.txt using the bash shell, I'd use the following:
>
> cat ../myFile.txt
>
> Also, for example 2, if I want to cd into a folder that contains my files,
from within a loop, where the counter serves as one of the folders in the path.
>
> In bash:
>
> for i in {1..5} A B C # A, B, and C are also folder names
> do
> cd ~/${i} # move into (change working directory to?) my folder of interest,
which is 1,2,3,4,5,A,B,or C
> cat myFile.txt # print corresponding file of interest to screen
> cd - # move back to the previous folder
> done
>
>
> I wonder if there's an easy corresponding way to accomplish this in R.
>
> Any ideas most welcome!
>
> Jonathan
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O