Often large collections of data will be broken into multiple smaller files. The command line makes it easy to concatenate the contents of these files into a single file for analysis.
Create Multiple Files
In this example each file contains a single record of a sale, however in the real world each file can contain hundreds or even millions of records.
echo 'Alan Jones', '$50' > sales_records_1.csv echo 'Stephanie Lawson', '$20' > sales_records_2.csv echo 'Lester Holt', '$10' > sales_records_3.csv
Append All Files To A Single File
Specifically, what we are doing in the code below is appending (
>>) every file with
sales_records_ in the file name (e.g.
sales_records_1.csv) to a file called
cat sales_records_* >> sales_records.csv
View The Single File To Confirm The Appending Worked
Alan Jones, $50 Stephanie Lawson, $20 Lester Holt, $10
Note that the contents of the files were concatenated in ascending order, meaning
sales_records_1.csv’s data comes before
sales_records_1.csv’s data in the final file.