I believe z2 refers to a backgrounded process error message, 2 being the error status and z referring to its being a backgrounded process.
Here you go:
http://write.flossmanuals.net/command-line/processes/
TC
Here you go:
http://write.flossmanuals.net/command-line/processes/
TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.