How to hide RMAN command line args from "ps -ef" command?

Hi there
This is not RMAN question per say but it is related to my RMAN script. Part of this RMAN script is below:
rman target / catalog ${RMANID}/${RMANPW}@${RMANSID} log=${TMPFILE} << EOF
While the script is running, if I issue "ps -ef | grep rman" command (from my own user id or as 'oracle' user), I see following:
oracle 32522 32492 36 15:32 pts/1
00:00:01 rman target / catalog rman/rman2013@rmancat log=/tmp/oratmp32492
Is there a way to hide the values of the variables (Id, Pwd, SID) from the "ps -ef" command?
If not, any other an alternates?
Best regards

How to Hide RMAN Passwords when Connecting to a Target Database (Doc ID 183377.1)
How To Hide Usernames And Passwords In RMAN Logfile (Doc ID 246192.1)

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