AFAICT it should work exactly like windows but replacing the "sdcli.exe" launcher with the "sdcli" script found in the same directory.
I recall some issue reported for this. Probably either of these will work:
1. Run sdcli directly from your linux installation's .../sqldeveloper/sqldeveloper/bin directory.
2. Edit sdcli to include your linux installation's full .../sqldeveloper/sqldeveloper/bin path before the "sqldeveloper" command.
1. If installed via rpm, the full path probably begins with /opt/
2 If installed by unzipping the generic version, you will need to give sdcli execute privilege (chmod u+x sdcli)
Hope this helps,
SQL Developer Team