ps: improve the parameter output of the ps command

[Franklin-Qi]

Improve the parameter output of the ps command so thatcargo run -q ps -A -e does not report errors.

$ ps -A -e |head -n5 && cargo run -q ps -A -e |head -n5
    PID TTY          TIME CMD
      1 ?        00:00:57 systemd
      2 ?        00:00:00 kthreadd
      3 ?        00:00:00 pool_workqueue_release
      4 ?        00:00:00 kworker/R-rcu_gp
 PID     TTY    TIME      CMD 
 1       ?      00:00:57  systemd 
 2       ?      00:00:00  kthreadd 
 3       ?      00:00:00  pool_workqueue_release 
 4       ?      00:00:00  kworker/R-rcu_gp 

Fix #669

[codecov]

Codecov Report

❌ Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.20%. Comparing base (251f9b3) to head (c1801fd).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uu/ps/src/ps.rs	0.00%	4 Missing ⚠️
src/uu/ps/src/process_selection.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #664      +/-   ##
==========================================
+ Coverage   19.16%   19.20%   +0.03%     
==========================================
  Files          68       68              
  Lines       10147    10155       +8     
  Branches      545      546       +1     
==========================================
+ Hits         1945     1950       +5     
- Misses       8202     8205       +3     

Flag	Coverage Δ
macos_latest	6.74% <0.00%> (-0.01%)	⬇️
ubuntu_latest	19.55% <64.28%> (+0.03%)	⬆️
windows_latest	0.02% <0.00%> (-0.01%)	⬇️

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[Krysztal112233]

hum, I think you've written the wrong description.

Here's the -e you defined:

SIMPLE PROCESS SELECTION
...
       -e     Select all processes.  Identical to -A.
...

Its description is "Select all processes. Identical to -A.", and I think it's also an alias of -A (maybe? I'm not sure.)

But you wrote "Show the environment after the command.", which is under OUTPUT MODIFIERS:

OUTPUT MODIFIERS
...
       e      Show the environment after the command. <---- HERE
...

[Franklin-Qi]

hum, I think you've written the wrong description.

Here's the -e you defined:

SIMPLE PROCESS SELECTION
...
       -e     Select all processes.  Identical to -A.
...

Its description is "Select all processes. Identical to -A.", and I think it's also an alias of -A (maybe? I'm not sure.)

But you wrote "Show the environment after the command.", which is under OUTPUT MODIFIERS:

OUTPUT MODIFIERS
...
       e      Show the environment after the command. <---- HERE
...

@Krysztal112233 Thank you for your review. I believe you are correct; this is a normal description, and I will make changes.

$  ps --help all 

Usage:
 ps [options]

Basic options:
 -A, -e               all processes
 -a                   all with tty, except session leaders
  a                   all with tty, including other users
 
...

Miscellaneous options:
 -c                   show scheduling class with -l option
  c                   show true command name
  e                   show the environment after command
  
...

        --help <simple|list|output|threads|misc|all>
                      display help and exit

For more details see ps(1).

[Krysztal112233]

you can get all documents from man ps command

[Franklin-Qi]

@Krysztal112233 Thanks, the description here is indeed much clearer.

[Krysztal112233]

LGTM, thanks for your contribution :)