recsel:tldr:239b0
recsel: Use "~" to match a string with a given regular expression.
$ recsel -e "${field_name} ~ '${regular_expression}' ${data-rec}"
try on your machine
The command "recsel" is being used here. It is likely a command-line utility that allows selecting and manipulating records in a data file.
The command starts with "-e", which is an option used to specify the expression (or query) to filter the records.
"${field_name} ~ '${regular_expression}' ${data-rec}" is the expression being used here. It consists of three parts:
- "${field_name}" is a placeholder that should be replaced with the name of the field you want to search for.
- "~" is a comparison operator that tests if a field matches the specified regular expression.
- "'${regular_expression}'" is the regular expression pattern (enclosed in single quotes) that represents the search criteria. The regular expression is used to define a pattern that the field must match.
- "${data-rec}" is another placeholder that should be replaced with the name of the data file or data source you want to query.
In summary, the command is used to select records from a data source where a specific field matches a given regular expression pattern.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.