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Append multiple csv files into one file using R


Append multiple csv files into one file using R

By : Alexander
Date : November 20 2020, 03:01 PM
I wish did fix the issue. I Have multiple csv files that i have already read into R. Now I want to append all these into one file. I tried few things but getting different errors. Can anyone please help me with this? , Sample CSV Files
Note
code :
A,B,C,D
1,2,3,4
2,3,4,5
3,4,5,6
1,1,1,1
2,2,2,2
44,44,44,44
4,4,4,4
4,4,4,4
33,33,33,33
11,1,11,1  
 A,B,C,D
 1,2,3,40
 2,3,4,50
 3,4,50,60
 4,4,4,4
 5,5,5,5
 6,6,6,6   
## List filenames to be merged. 
filenames <- list.files(path="E:/MergeCSV/",pattern="*.csv")

## Print filenames to be merged
print(filenames)
## [1] "abc.csv" "pqr.csv"
## Full path to csv filenames
fullpath=file.path("E:/MergeCSV",filenames)

## Print Full Path to the files
print(fullpath)
## [1] "E:/MergeCSV/abc.csv" "E:/MergeCSV/pqr.csv"
## Merge listed files from the path above
dataset <- do.call("rbind",lapply(filenames,FUN=function(files){ read.csv(files)}))

## Print the merged csv dataset, if its large use `head()` function to get glimpse of merged dataset
dataset
#     A  B  C  D
# 1   1  2  3  4
# 2   2  3  4  5
# 3   3  4  5  6
# 4   1  1  1  1
# 5   2  2  2  2
# 6  44 44 44 44
# 7   4  4  4  4
# 8   4  4  4  4
# 9  33 33 33 33
# 10 11  1 11  1
# 11  1  2  3 40
# 12  2  3  4 50
# 13  3  4 50 60
# 14  4  4  4  4
# 15  5  5  5  5
# 16  6  6  6  6

head(dataset)
#    A  B  C  D
# 1  1  2  3  4
# 2  2  3  4  5
# 3  3  4  5  6
# 4  1  1  1  1
# 5  2  2  2  2
# 6 44 44 44 44

## Print dimension of merged dataset
dim(dataset)
## [1] 16  4


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Using PowerShell, read multiple known file names, append text of all files, create and write to one output file

Using PowerShell, read multiple known file names, append text of all files, create and write to one output file


By : Anthony Taitt
Date : March 29 2020, 07:55 AM
it should still fix some issue I have five .sql files and know the name of each file. For this example, call them one.sql, two.sql, three.sql, four.sql and five.sql. I want to append the text of all files and create one file called master.sql. How do I do this in PowerShell? Feel free to post multiple answers to this problem because I am sure there are several ways to do this.
code :
Get-Content one.sql,two.sql,three.sql,four.sql,five.sql > master.sql
How to append contents of multiple files into one file

How to append contents of multiple files into one file


By : M.Holt
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You need the cat (short for concatenate) command, with shell redirection (>) into your output file
code :
cat 1.txt 2.txt 3.txt > 0.txt
How do I append to each line of a .txt file using cmd across multiple files

How do I append to each line of a .txt file using cmd across multiple files


By : Nikhil Kumar
Date : March 29 2020, 07:55 AM
help you fix your problem I have a large amount of .txt files residing in a single directory that have contents resembling the following... , not tested.
code :
break>united.txt
for %%a in (*.txt) do (
   for /f "usebackq tokens=* delims=" %%# in ("%%~fa") do (
        (echo(%%#,%%~nxa)>>united.txt
   )
)
How to append a file to multiple files in shell?

How to append a file to multiple files in shell?


By : yurioyoko
Date : March 29 2020, 07:55 AM
may help you . I have a TXT file that I need to append at the bottom of multiple files. I'm currently using for loop for that : , The tee command allows you to apply changes to several files at once.
How to append multiple files into one file as a whole using perl?

How to append multiple files into one file as a whole using perl?


By : Tarspo
Date : March 29 2020, 07:55 AM
hope this fix your issue As Shawn mentioned above, you can read a block at a time. You can experiment with different block sizes to see what is fastest on your system. For example:
code :
my $BLOCK_SIZE = 1024 * 1024 * 2;    # try reading 2 megabytes at a time
my $outfile = "output.csv";
open(OUT, ">>", $outfile) or die "Can't append to output file $outfile: $!\n";
foreach my $input_file (@input_files) {
     open(IN, "<", $input_file) or die "Can't read from input file $input_file: $!\n";
     my $data;
     my $blocks_read = 0;
     while (read(IN, $data, $BLOCK_SIZE)) {
         print OUT $data;
         $blocks_read++;
     }
     close IN;
     print "Read $blocks_read blocks from $input_file\n";
     }
close OUT;
}
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