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concatenate multiple csv files using dos and keeping header from first file


concatenate multiple csv files using dos and keeping header from first file

By : wbraham
Date : November 19 2020, 01:01 AM
With these it helps You create a file "combined.csv". This is matched with *.csv
A possible workaround:
code :


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Unix:merge multiple CSV files with same header by keeping the header of the first file

Unix:merge multiple CSV files with same header by keeping the header of the first file


By : 0ldg33zer
Date : March 29 2020, 07:55 AM
help you fix your problem I have to merge multiple CSV files with same headers. I have to keep the header of the first file and remove headers of all the other files and merge them and create one master file.
code :
awk 'FNR==1 && NR!=1{next;}{print}' *.csv
> cat file1.csv
Id,city,name ,location
1,NA,JACK,CA
>
> cat file2.csv
ID,city,name,location
2,NY,JERRY,NY
>
> nawk 'FNR==1 && NR!=1{next;}{print}' *.csv
Id,city,name ,location
1,NA,JACK,CA
2,NY,JERRY,NY
> 
Merge multiple excel files, while keeping the Header Row from first File only

Merge multiple excel files, while keeping the Header Row from first File only


By : John Ritch
Date : March 29 2020, 07:55 AM
Any of those help I tried searching for this a lot, but could not find a satisfactory answer. Sorry if it's a repost. , Try replacing the line...
code :
wsSource.UsedRange.Copy
wsSource.UsedRange.Resize(wsSource.UsedRange.Rows.Count - 1, wsSource.UsedRange.Columns.Count).Offset(1, 0).Copy
How to concatenate multiple files with same header? Some of the files only have header

How to concatenate multiple files with same header? Some of the files only have header


By : M. Maddali
Date : March 29 2020, 07:55 AM
will be helpful for those in need I have a huge number of files named 0.file.csv,.., 1000.file.csv. I need to concatenate the files, only keep the header of the first file, and get rid of the headers of the rest of the files. The solution I came up with is: , A simpler awk command:
code :
awk 'FNR>1 || NR==1' {0..1000}.file.csv
SQL concatenate many tsv files into single table in a database, while keeping track of file source (MonetDBLite)

SQL concatenate many tsv files into single table in a database, while keeping track of file source (MonetDBLite)


By : Krupali D. Donda
Date : March 29 2020, 07:55 AM
To fix the issue you can do Following xQbert's suggestion, I solved using SQL commands only (necessary and faster than bash commands, considering my data is 10s of files, each millions of lines long).
code :
library(DBI)
library(MonetDBLite)

# Write tsv file of mtcars
write.table(mtcars, "mtcars.tsv", row.names=FALSE, sep= "\t")

# Write tsv of second mtcars
mtcars2 <- mtcars
mtcars2$mpg <- mtcars2$mpg + 5
write.table(mtcars2, "mtcars2.tsv", row.names= FALSE, sep = "\t")

# Initialize MonetDB
dbdir <- "/Users/admin/"
con <- dbConnect(MonetDBLite::MonetDBLite(), dbdir)

# Write table
dbWriteTable(con, "test4", "mtcars.tsv", delim="\t")

# Add data source information
dbSendQuery(con, "ALTER TABLE test4 ADD source TEXT")
dbSendQuery(con, "UPDATE test4 SET source = 'dataset1'")

# Write second dataset to a temporary table
dbWriteTable(con, "temptable", "mtcars2.tsv", delim="\t")

# Add data source information
dbSendQuery(con, "ALTER TABLE temptable ADD source TEXT")
dbSendQuery(con, "UPDATE temptable SET source = 'dataset2'")

# Insert temp table into main table
dbSendQuery(con, "INSERT INTO test4 SELECT * FROM temptable")

# Drop temp table
dbSendQuery(con, "DROP TABLE temptable")

# Checking the data, truncated for clarity
> dbGetQuery(con, "SELECT * FROM test4")
mpg cyl  disp  hp drat    wt  qsec vs am gear carb   source
1  21.0   6 160.0 110 3.90 2.620 16.46  0  1    4    4 dataset1
2  21.0   6 160.0 110 3.90 2.875 17.02  0  1    4    4 dataset1
3  22.8   4 108.0  93 3.85 2.320 18.61  1  1    4    1 dataset1
...
33 26.0   6 160.0 110 3.90 2.620 16.46  0  1    4    4 dataset2
34 26.0   6 160.0 110 3.90 2.875 17.02  0  1    4    4 dataset2
35 27.8   4 108.0  93 3.85 2.320 18.61  1  1    4    1 dataset2
...
64 26.4   4 121.0 109 4.11 2.780 18.60  1  1    4    2 dataset2
Efficiently join multiple CSV files keeping the header from first file in C#

Efficiently join multiple CSV files keeping the header from first file in C#


By : Kalin
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further If the headers are the same, then you can just open a write stream, then go through all the input files, opening read streams for them and copying data. The first file is copied in its entirety. Subsequent files have the first line skipped.
That approach would be the fastest, so long as you are 100% sure the columns align and it's only the first line that needs skipping.
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