lvs:tldr:25a56

The command "lvs -o ${field_name_1},${field_name_2}" is used to retrieve specific fields from the output of the "lvs" command. "lvs" stands for Logical Volume Scan and is a command-line utility in Linux used to display information about logical volumes in the system.

The "-o" option is followed by the names of the fields that you want to display in the output. In this command, "${field_name_1}" and "${field_name_2}" represent placeholders for the actual field names you want to specify.

You need to replace "${field_name_1}" and "${field_name_2}" with the actual names of the fields you want to include in the output. For example, if you want to display the name and size of logical volumes, you would replace "${field_name_1}" with "lv_name" and "${field_name_2}" with "lv_size" like this:

lvs -o lv_name,lv_size

After running this command, the "lvs" utility will only output the specified fields, in this case, the logical volume name and size.