iApp obtain username

Meanwhile I found the solution. Following command in the implementation section will set my variable vuserid. Scan the audit log for the last user that did logon in the GUI:

set vuserid [exec cat /var/log/audit | grep "httpd(mod_auth_pam)" | grep "Administrator" | awk "{print \$11}" | tail -1]

Since normally there is only one updating the F5 environment, this command should give us the name of the user executing the iApp.

Note: the who am I command will give you your name when executing in tmsh shell, NOT in the GUI.