xsv:tldr:d005c

The command xsv join --no-case ${column_a} ${filename-a-csv} ${column_b} ${filename-b-csv} | xsv table is a command-line instruction that uses the xsv tool to perform a join operation on two CSV files based on specified columns. Here's what each part of the command does:

• xsv: It is a command-line tool for working with CSV files. It provides various functions to manipulate, analyze, and process CSV data.
• join: It is a subcommand in xsv that performs the join operation on two input CSV files.
• --no-case: It is an option used with the join subcommand to perform a case-insensitive matching during the join operation. This means that the values in the join columns will be compared regardless of their case (e.g., "apple" and "APPLE" will match).
• ${column_a}: It is a placeholder representing the name or index of the join column from the first CSV file (${filename_a_csv}) that will be used for the join operation.
• ${filename-a-csv}: It is a placeholder representing the filename of the first input CSV file.
• ${column_b}: It is a placeholder representing the name or index of the join column from the second CSV file (${filename_b_csv}) that will be used for the join operation.
• ${filename-b-csv}: It is a placeholder representing the filename of the second input CSV file.

The output of the join command is then piped (|) to another xsv command:

• xsv table: This command formats the output of the previous join operation in a table-like structure for easy human-readable representation. It displays the resulting joined CSV data in a tabular format.

Overall, this command performs a case-insensitive join operation on two CSV files using specified columns and displays the result in a table format.