Cita:
Iniciado por cucuru 
(...) la quinta VSZ ¿que es VSZ? (...)
man ps
vsz = virtual memory size of the process in KiB (1024-byte units). Device mappings are currently excluded; this is subject to change. (alias vsize)
Cita: la sexta RSS ¿que es RSS?
man ps
rss = resident set size, the non-swapped physical memory that a task has used (in kiloBytes). (alias rssize, rsz).
Cita: la septima TTY ¿que es TTY?
man ps
tty = controlling tty (terminal). (alias tname, tt).
Cita: la octava STAT ¿que es STAT y que significan sus posibles valores, S, R y Ss por lo que he visto?
man ps
PROCESS STATE CODES
Here are the different values that the s, stat and state output specifiers
(header "STAT" or "S") will display to describe the state of a process.
D Uninterruptible sleep (usually IO)
R Running or runnable (on run queue)
S Interruptible sleep (waiting for an event to complete)
T Stopped, either by a job control signal or because it is being traced.
W paging (not valid since the 2.6.xx kernel)
X dead (should never be seen)
Z Defunct ("zombie") process, terminated but not reaped by its parent.
For BSD formats and when the stat keyword is used, additional characters may
be displayed:
< high-priority (not nice to other users)
N low-priority (nice to other users)
L has pages locked into memory (for real-time and custom IO)
s is a session leader
l is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)
+ is in the foreground process group
Cita: la décima el tiempo, ¿porque siempre es cero?
Ahí me has pillao.