Description of problem:

Line 495 from the ps man page has the example "ps jax --sort=uid,-ppid,+pid". 
When entering this command however FC5 says "ERROR: Unknown sort specifier." 
I'm pretty sure this worked in RHEL 3 so I doubt it is a documentation bug. 
Looks like the --sort option in ps has a bug.


Version-Release number of selected component (if applicable):

procps version 3.2.6

How reproducible:
Very.  Happens every time.

Steps to Reproduce:
1.  ps jax --sort=uid,-ppid,+pid
2.
3.
  
Actual results:

ERROR: Unknown sort specifier.
********* simple selection *********  ********* selection by list *********
-A all processes                      -C by command name
-N negate selection                   -G by real group ID (supports names)
-a all w/ tty except session leaders  -U by real user ID (supports names)
-d all except session leaders         -g by session OR by effective group name
-e all processes                      -p by process ID
T  all processes on this terminal     -s processes in the sessions given
a  all w/ tty, including other users  -t by tty
g  OBSOLETE -- DO NOT USE             -u by effective user ID (supports names)
r  only running processes             U  processes for specified users
x  processes w/o controlling ttys     t  by tty
*********** output format **********  *********** long options ***********
-o,o user-defined  -f full            --Group --User --pid --cols --ppid
-j,j job control   s  signal          --group --user --sid --rows --info
-O,O preloaded -o  v  virtual memory  --cumulative --format --deselect
-l,l long          u  user-oriented   --sort --tty --forest --version
-F   extra full    X  registers       --heading --no-heading --context
                    ********* misc options *********
-V,V  show version      L  list format codes  f  ASCII art forest
-m,m,-L,-T,H  threads   S  children in sum    -y change -l format
-M,Z  security data     c  true command name  -c scheduling class
-w,w  wide output       n  numeric WCHAN,UID  -H process hierarchy

Expected results:

Sorted output from ps.

Additional info: