Hello,Here is the example:?? ??file name? ? first row??file1.txt? ? ?abc.txt??file2.txt? ? ?bed.txt??file3.txt? ? ?gogo.txt??.?.?file1243.txt? ? last.txt???? I want to use loop because I need to read the first row information for first file, and then rename the file, then go to next file. I'm not sure if this is right way to approach my goal. Any suggestion will be appreciated.?Thanks,?Kai On Friday, September 16, 2022 at 10:38:32 AM PDT, Rui Barradas <ruipbarradas at sapo.pt> wrote: Hello, Please post the first row of 2 or 3 files and the expected result. You can rename files with ?file.rename. This function is vectorized its on arguments so you do not need a loop, only the source and destination filenames. Both vectors should have the same length, if not strange things will occur including data loss. Hope this helps, Rui Barradas ?s 18:26 de 16/09/2022, Kai Yang via R-help escreveu:> Hello,I have a lot of files with not meaningful name, such as:? file1.txt, file2.txt ...... I need to rename them using the information from the first row of the files. Now I can get the information from the first row of each file. Now, I need know how to rename them in R (using loop?).?Thank you for your helpKai > > > ??? [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.[[alternative HTML version deleted]]
Hello,
Something like the following might work.
filenames <- list.files(pattern = "^file\\d+\\.txt$")
destnames <- sapply(filenames, scan, what = character(), sep =
"\n", n =
1L, strip.white = TRUE)
if(length(filenames) == length(destnames))
file.rename(filenames, destnames)
else message("something went wrong")
But I would make copies of 2 or 3 files first and test with, say,
filenames[1:2] and destnames[1:2]
Hope this helps,
Rui Barradas
?s 18:51 de 16/09/2022, Kai Yang escreveu:> Hello,Here is the example:
> ??file name? ? first row??file1.txt? ? ?abc.txt??file2.txt? ?
?bed.txt??file3.txt? ? ?gogo.txt??.?.?file1243.txt? ? last.txt
> I want to use loop because I need to read the first row information for
first file, and then rename the file, then go to next file. I'm not sure if
this is right way to approach my goal. Any suggestion will be
appreciated.?Thanks,?Kai On Friday, September 16, 2022 at 10:38:32 AM PDT,
Rui Barradas <ruipbarradas at sapo.pt> wrote:
>
> Hello,
>
> Please post the first row of 2 or 3 files and the expected result.
>
> You can rename files with ?file.rename. This function is vectorized its
> on arguments so you do not need a loop, only the source and destination
> filenames. Both vectors should have the same length, if not strange
> things will occur including data loss.
>
> Hope this helps,
>
> Rui Barradas
>
> ?s 18:26 de 16/09/2022, Kai Yang via R-help escreveu:
>> Hello,I have a lot of files with not meaningful name, such as:?
file1.txt, file2.txt ...... I need to rename them using the information from the
first row of the files. Now I can get the information from the first row of each
file. Now, I need know how to rename them in R (using loop?).?Thank you for your
helpKai
>>
>>
>> ??? [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
>
The syntax might not be quite right, but why not something like file.rename(colnames(dataframe)[1]) -- Using colnames to get the names of the columns that are in the first row, selecting the first element from colnames() and setting the file name equal to that. Do a for loop using current file names in some folder, and save to a new folder. Tim -----Original Message----- From: R-help <r-help-bounces at r-project.org> On Behalf Of Kai Yang via R-help Sent: Friday, September 16, 2022 1:52 PM To: R-help Mailing List <r-help at r-project.org>; Rui Barradas <ruipbarradas at sapo.pt> Subject: Re: [R] rename files in R [External Email] Hello,Here is the example: file name first row file1.txt abc.txt file2.txt bed.txt file3.txt gogo.txt . . file1243.txt last.txt I want to use loop because I need to read the first row information for first file, and then rename the file, then go to next file. I'm not sure if this is right way to approach my goal. Any suggestion will be appreciated. Thanks, Kai On Friday, September 16, 2022 at 10:38:32 AM PDT, Rui Barradas <ruipbarradas at sapo.pt> wrote: Hello, Please post the first row of 2 or 3 files and the expected result. You can rename files with ?file.rename. This function is vectorized its on arguments so you do not need a loop, only the source and destination filenames. Both vectors should have the same length, if not strange things will occur including data loss. Hope this helps, Rui Barradas ?s 18:26 de 16/09/2022, Kai Yang via R-help escreveu:> Hello,I have a lot of files with not meaningful name, such as: > file1.txt, file2.txt ...... I need to rename them using the > information from the first row of the files. Now I can get the > information from the first row of each file. Now, I need know how to > rename them in R (using loop?). Thank you for your helpKai > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat > .ethz.ch%2Fmailman%2Flistinfo%2Fr-help&data=05%7C01%7Ctebert%40ufl > .edu%7C559ca95ca7d34937799a08da980c3995%7C0d4da0f84a314d76ace60a62331e > 1b84%7C0%7C0%7C637989475519163868%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4w > LjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > &sdata=lPW2XrQntw3V7eJmxkaoOXK75%2FO1hWgRv7FO3%2B5O3OQ%3D&rese > rved=0 PLEASE do read the posting guide > https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r > -project.org%2Fposting-guide.html&data=05%7C01%7Ctebert%40ufl.edu% > 7C559ca95ca7d34937799a08da980c3995%7C0d4da0f84a314d76ace60a62331e1b84% > 7C0%7C0%7C637989475519320101%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM > DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C& > sdata=%2FaSxvb47qFp7Mo6MFlCEQcvinHvV%2FWA%2Brs3keoNuTqk%3D&reserve > d=0 and provide commented, minimal, self-contained, reproducible code.[[alternative HTML version deleted]] ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat.ethz.ch%2Fmailman%2Flistinfo%2Fr-help&data=05%7C01%7Ctebert%40ufl.edu%7C559ca95ca7d34937799a08da980c3995%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C637989475519320101%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=tCreTbW2QEMePdooZNVmtpl6kKSVMXv9E0oIBYBTMBQ%3D&reserved=0 PLEASE do read the posting guide https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r-project.org%2Fposting-guide.html&data=05%7C01%7Ctebert%40ufl.edu%7C559ca95ca7d34937799a08da980c3995%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C637989475519320101%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2FaSxvb47qFp7Mo6MFlCEQcvinHvV%2FWA%2Brs3keoNuTqk%3D&reserved=0 and provide commented, minimal, self-contained, reproducible code.