Can you read the environment via ps, pstree or top?

If so how?

The only way I know (on Linux) is via /proc.

ps has an "e" flag:

/home/alex>env - PASSWORD=SECRET sleep 100 &
[1] 30765

/home/alex>ps e
  PID TTY      STAT   TIME COMMAND
 1749 pts/1    Ss     0:00 -bash USER=alex LOGNAME=alex HOME=/home/ale
+x PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin M
+AIL=/var/mail/alex
 5580 pts/1    R+     0:00 ps e CPLUS_INCLUDE_PATH=/usr/lib64/qt/inclu
+de MANPATH=/usr/local/man:/usr/man:/usr/lib64/java/man:/opt/bincimap/
+man:/opt/swish-e/ma
30765 pts/1    S      0:00 sleep 100 PASSWORD=SECRET

/home/alex>ps --version
procps version 3.2.8

/home/alex>
[download]

pstree and top can show command line arguments (using pstree -a), but they can't list the environment.

Alexander