In a remote shell, how can I find the domain name of the computer from which I logged into the remote machine?
Example: My local machine is mi.pona.com. On this machine I run
ssh [email protected] to login into the remote machine sina.pona.com. In the shell which opens (running on the remote machine) I want to find out from which computer I logged in, so I want to get the result "mi.pona.com". Is there a command for this?
On my Red Hat 7 machine, I run who am i or who am I or who -m.
The last column will show the machine name where I logged in from (in parenthesis). If I am on my local machine, the last column will show my console/display ID. On my machine it is (:0).
Caveat This only works on an interactive shell.
ssh ScottieH@RemoteServer who -m will give unexpected results.
On my Red Hat 7 machine, It spews an error.
YMMV
who am i doesn't work. who am I doesn't work. who -m returns the same as who. and why not just use w? w doesn't show me the address, but w -f does. who am i is showing me the same output as who and who -m. The manpage says "If ARG1 ARG2 given, -m presumed: 'am i' or 'mom likes' are usual." That seems to indicate that who am i should always be the same as who -m. This is GNU's who v8.31. who says "If given two non-option arguments, ‘who’ prints only the entry for the user running it (determined from its standard input), preceded by the hostname. Traditionally, the two arguments given are ‘am i’, as in ‘who am i’". Also, strangely enough, w shows addresses on RHEL but doesn't on Manjaro (I've never tried running w locally before). whoami vs who am i vs who -m, etc. is OS (Flavor, version & perhaps platform) dependent. Tjat is why I specified all of the programs that I know work on my machine -- and specified the OS version. Also note the YMMV caveat: Your Mileage May Vary). The last OS I used that had w was actually an alias to who -m. Not every one has access to the last database. You can use w, who or even last.
Also you can check sshd logs, journalctl -u sshd -n 100
whoamiandSSH_CONNECTION. On unix.stackexchange.com/questions/101955/… the top answer only mentionswho, but you can fix that by voting for the better answer.