recsel:tldr:4ca27

The command recsel -e "name ~ '${regular_expression}' && version ~ '${regular_expression}'" ${data-rec} is used to select multiple records (rows) from a dataset (data-rec) based on two conditions.

Here's a breakdown of the command:

• recsel: This is the name of a program or command-line tool that likely stands for "record selector". It is used to select specific records from a dataset.

• -e "name ~ '${regular_expression}' && version ~ '${regular_expression}'": This option specifies the expression or conditions that the records must meet in order to be selected. In this case, there are two conditions separated by the logical operator &&.

  • name ~ '${regular_expression}': This condition verifies if the value in the "name" column matches a provided regular expression, specified by the ${regular_expression} placeholder. The ~ symbol indicates a regular expression match.

  • version ~ '${regular_expression}': This condition is similar to the previous one but checks if the value in the "version" column matches the regular expression.

• ${data-rec}: This is the dataset or file from which the records will be selected. It is likely a placeholder for the actual dataset file name.

In summary, the command selects records from the dataset based on two conditions: the "name" column must match the regular expression ${regular_expression}, and the "version" column must also match the same regular expression.