Merge CSV files Post: 302945712

Sponsored Content

Top Forums Shell Programming and Scripting Merge CSV files Post 302945712 by Don Cragun on Tuesday 2nd of June 2015 12:44:08 AM

06-02-2015

Registered User

rk4k,
The output produced by your script and the scripts suggested by Scrutinizer do not match the output you said you wanted. The heading line and the last line that you showed in your expected result are not included in the output they produce.

I haven't tried a performance comparison, but the following uses fewer processes and pushes less data through the pipes so it could be faster. With your sample input files, the following code:

Code:

for file in *.csv
do	printf '%s\n' "$file"
done | awk '
{	file = $0
	while((getline < file) == 1) {
		if(/Date/ && ! count[$0]++) {
			print
			continue
		}
		if(/"",""/ && $0 > trailer) {
			trailer = $0
			continue
		}
		if(! count[$0]++)
			print | "sort"
	}
	close(file)
}
END {	close("sort")
	print trailer
}'

produces the output:

Code:

"Date","Inbound","Outbound"
"2015-06-01 13:45:00","102061994.58","30970432.36"
"2015-06-01 13:50:00","101806973.26","31345909.05"
"2015-06-01 13:55:00","104203841.45","31944063.26"
"2015-06-01 14:00:00","87749793.77","31403776.19"
"2015-06-01 14:05:00","74034336.32","31371706.30"
"2015-06-01 14:10:00","58456052.80","30244690.38"
"2015-06-01 14:15:00","68841405.45","31038223.80"
"2015-06-01 14:20:00","91816301.42","31397426.60"
"2015-06-01 14:25:00","109179816.57","31436652.92"
"2015-06-01 14:30:00","113248200.09","31885767.39"
"2015-06-01 14:35:00","94289765.97","30544861.40"
"2015-06-01 14:40:00","102619582.08","31742486.29"
"2015-06-01 14:45:00","84352207.67","30581944.65"
"2015-06-01 14:50:00","93056971.42","30470065.37"
"2015-06-01 14:55:00","78773346.56","29866197.88"
"2015-06-01 15:00:00","",""

which seems to be what you said you wanted.

And, even with thousands of .csv files in the current directory, it shouldn't have any problems with E2BIG errors that you might get expanding the argument list for cat *.csv or grep ... *.csv.

These 2 Users Gave Thanks to Don Cragun For This Post:

Don Cragun

View Public Profile for Don Cragun

Find all posts by Don Cragun

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Merge 2 csv files with awk

I have 2 files pipe delimted and want to merge them based on a key e.g file 1 123$aaa$yyy$zzz 345$xab$yzy$zyz 456$sss$ttt$foo 799$aaa$ggg$dee file 2 123$hhh 345$ddd 456$xxx 888$zzz so if the key is the first field, and the result should be the common key between file 1 and 2

2. Shell Programming and Scripting

Merge 2 CSV files using sed

Help in writing a script using sed which updates fileOne with the contents from fileTwo Example: Contents of fileOne 1,111111 2,897823 3,235473 4,222222 Contents of fileTwo 1,111111,A,1,2 4,222222,A,2,2 5,374632,A,3,2 6,374654,A,4,2 Final File should be: 1,111111,A,1,2...

3. Shell Programming and Scripting

Merge CSV files and create a column with the filename from the original file

Hello everyone!! I am not completely new to shell script but I havent been able to find the answer to my problem and I'm sure there are some smart brains here up for the challenge :D. I have several CSV files that I need to combine into one, but I also need to know where each row came from....

4. UNIX for Dummies Questions & Answers

Merge all csv files in one folder considering only 1 header row and ignoring header of all others

Friends, I need help with the following in UNIX. Merge all csv files in one folder considering only 1 header row and ignoring header of all other files. FYI - All files are in same format and contains same headers. Thank you

5. Shell Programming and Scripting

Merge *.csv files, each in separate sheets

Does anyone know how to Merge *.csv files, each in seperate sheets?

6. UNIX for Dummies Questions & Answers

Need help combining txt files w/ multiple lines into csv single cell - also need data merge

:confused:Hello -- i just joined the forums. I am a complete noob -- only about 1 week into learning how to program anything... and starting with linux. I am working in Linux terminal. I have a folder with a bunch of txt files. Each file has several lines of html code. I want to combine...

7. UNIX for Dummies Questions & Answers

Merge two csv files using column name

Hi all, I have two separate csv files(comma delimited) file 1 and file 2. File 1 contains PAN,NAME,Salary AAAAA5467D,Raj,50000 AAFAC5467D,Ram,60000 BDCFA5677D,Kumar,90000 File 2 contains PAN,NAME,Dept,Salary ASDFG6756T,Karthik,ABC,450000 QWERT8765Y,JAX,CDR,780000...

8. Shell Programming and Scripting

I am trying to merge all csv files from source path into 1 file

I am trying to merge all csv files from source path into one single csv file in target. but getting error message: hadoop fs -cat /user/hive/warehouse/stage.db/PK_CLOUD_CHARGE/TCH-charge_*.csv > /user/hive/warehouse/stage.db/PK_CLOUD_CHARGE/final/TCH_pb_charge.csv getting error message:...

9. Shell Programming and Scripting

Compare and merge two big CSV files

Hi all, i need help. I have two csv files with a huge amount of data. I need the first column of the first file, to be compared with the data of the second, to have at the end a file with the data not present in the second file. Example File1: (only one column) profile_id 57036226...

10. UNIX for Beginners Questions & Answers

Merge the three csv files as one according to first coloumn.

I have three files with similar pattern i need to merge all the coloumns side by side from all three files according to the first coloumn example as shown below I mentioned 5 coloumns only in example but i have around 15 coloumns in each file. file1: Name,Samples,Error,95RT,90RT...

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Merge 2 csv files with awk

Discussion started by: loloAix

2. Shell Programming and Scripting

Merge 2 CSV files using sed

Discussion started by: NewToSed

3. Shell Programming and Scripting

Merge CSV files and create a column with the filename from the original file

Discussion started by: fransanchezoria

4. UNIX for Dummies Questions & Answers

Merge all csv files in one folder considering only 1 header row and ignoring header of all others

Discussion started by: Shiny_Roy

5. Shell Programming and Scripting

Merge *.csv files, each in separate sheets

Discussion started by: frhling

6. UNIX for Dummies Questions & Answers

Need help combining txt files w/ multiple lines into csv single cell - also need data merge

Discussion started by: jetsetter

7. UNIX for Dummies Questions & Answers

Merge two csv files using column name

Discussion started by: Nivas

8. Shell Programming and Scripting

I am trying to merge all csv files from source path into 1 file

Discussion started by: cplusplus1

9. Shell Programming and Scripting

Compare and merge two big CSV files

Discussion started by: SirMannu

10. UNIX for Beginners Questions & Answers

Merge the three csv files as one according to first coloumn.

Discussion started by: Raghuram717