Update cheatsheets

kinit

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# kinit
+
+> Authenticate a principal with a Kerberos server to gain and cache a ticket.
+> Note: A Kerberos principal can be either a user, service, or application.
+> More information: <https://web.mit.edu/kerberos/krb5-1.12/doc/user/user_commands/kinit.html>.
+
+- Authenticate a user and obtain a ticket-granting ticket:
+
+`kinit {{username}}`
+
+- Renew a ticket-granting ticket:
+
+`kinit -R`
+
+- Specify a lifetime for the ticket:
+
+`kinit -l {{5h}}`
+
+- Specify a total renewable lifetime for the ticket:
+
+`kinit -r {{1w}}`
+
+- Specify a different principal name to authenticate as:
+
+`kinit -p {{principal@REALM}}`
+
+- Specify a different keytab file to authenticate with:
+
+`kinit -t {{path/to/keytab}}`