vgs:tldr:b77f4

The command "vgs -o +${field_name}" is used to display specific information about the volume groups on a Linux system.

Here's a breakdown of the command:

• "vgs" is the command to display information about volume groups.
• "-o" is an option used to specify the output format.
• "+" is used to include additional fields in the output.
• "${field_name}" is a placeholder for the name of the specific field you want to include.

By using this command, you are instructing the system to display the specified field (identified by ${field_name}) in addition to the default fields when listing the volume groups. The command will output the selected field for each volume group in the system.