Sorry for the late reply. I didn't get email notification about an answer to my question :)
Actually, I just wrote <hostname> and so on for privacy. In my attempt, they have real values.
And yet, I got as result: "Message successfully transmitted, ID=-1".
Follow up question: do I really need to install everything even though I only want the client? Or is there somewhere a package just with the client code?
The <hostname> you have to actually replace with your real host name. Same for logbook, username and password.
On my local test system I get (actual password hidden here with "...")
~$ elog -h localhost -p 8080 -l demo -u stefan ... -a Authort=SR -a Subject=test test
Message successfully transmitted, ID=5
I just gave it a quick try to the command line client, to see if I can use it to access our institution service.
[root@host ~]# cd /tmp/
[root@host ~]# mkdir elog
[root@host ~]# cd elog
[root@host ~]# wget https://elog.psi.ch/elog/download/RPMS/elog-3.1.4-2.el7.x86_64.rpm
[root@host ~]# rpm2cpio elog-3.1.4-2.el7.x86_64.rpm | cpio -idmv
[root@host ~]# cd usr/local/bin/
[root@host ~]# ./elog --help
[root@host ~]# ./elog -h <hostname> -l <logbook> -u <myusername> <mypassword> -w last
"Message successfully transmitted, ID=-1"
Is that the expected output? I was expecting to see info about the latest message in the server.