How to find user/login id?

Shell Programming and Scripting
1

It seems like not all Unix have whoami. What is the alterate way to display just the login id?

Any help is appreciated
jak

2

Most shells have a USER envrionment variable.

echo $USER
3

try using id

4

Thanks .. i will try it out.

5

FYI, I stumbled upon 'logname' command and it gave me the user id.

Thanks,
jak

6

if you login as jdoe and then do su - tclark, then echo $USER and logname differ in their output

echo $USER would show tclark while logname would tell you jdoe