kinit:tldr:7e761

The command "kinit -l ${5h}" is used to authenticate a user to a Kerberos ticket-granting ticket (TGT) with a specific ticket lifetime.

• "kinit" is a command-line utility used to obtain and cache Kerberos tickets, which are required for authentication in a Kerberos realm.
• "-l" is a flag that specifies the ticket lifetime. In this case, "${5h}" is the value passed as the ticket lifetime.
• "${5h}" is a variable that represents a ticket lifetime of 5 hours. The "h" is an abbreviation for hours, indicating that the tickets obtained will be valid for 5 hours.

So, when you execute the "kinit -l ${5h}" command, it will authenticate the user to a Kerberos TGT and obtain tickets that will be valid for 5 hours.