csvtool:tldr:a58dc

The command "csvtool --column ${2} ${filename-csv}" is a command-line instruction that involves using the "csvtool" tool to manipulate data in a CSV file.

Here is the breakdown of the command and its components:

• "csvtool": This refers to the name of the command-line tool being used, which is "csvtool". The csvtool tool is designed to work with CSV files by performing operations like filtering, sorting, selecting columns, and more.

• "--column": This is an option or flag provided by the csvtool tool. It is used to specify the column(s) on which you want to perform a specific action. The column number is given by the value "${2}". This value is a placeholder that represents the second command-line argument provided when executing the command.

• "${2}": This is a placeholder that represents the second command-line argument provided when running the command. In the context of this command, it refers to the column number(s) on which you want to perform an action. For example, if you execute this command as "csvtool --column 3,5 filename.csv", it means that you want to perform an action on columns 3 and 5.

• "${filename-csv}": This is another placeholder that represents the filename of the CSV file you want to work with. The actual filename must be provided as a command-line argument when running the command. For example, if you execute this command as "csvtool --column 2 input.csv", it means you want to perform an action on the second column of the "input.csv" file.

In summary, this command with csvtool will perform an action (determined by the specific command or subcommand used) on the specified column(s) of the provided CSV file.