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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.