thx! OK, after looking into this, after changing ‘sed -nu‘ to ‘sed -n‘, what’s actually happening is that there _is_ no /proc system in Darwin, so the eval command either hangs or throws an error.
Sucks for us Mac users!

Ya some versions (mostly older) of sed don’t support the -u unbuffered option, I’ve since removed it since it’s a bit overkill anyway and multi-platform robustness is always the goal with bash. It would be helpful if you explained more about what you mean by ‘hanging’ without the -u option. It’s probably related to something other than the u option, a $ set +xv will tell us why (please share what you find).

Thanks for the feedback bro, I use mac’s all the time too (though I greatly prefer nix.)

[2873:2872 0:73] 01:50:46 Tue Jun 08 [user@host:/dev/pts/0 +1] ~
(1:73)$

Please, could you care to explain some chunks of the output?

[2873:2872 0:73] <- what are this?

[user@host:/dev/pts/0 +1] <- what's the +1 here?

(1:73)$ <- I understand the 73 here is the number of commands I've in the history. What about the 1? And what's the practical use of this numbers?

Thanks in advance.

        # now this is where things gets really farout, figure out how this works and you'll learn alot
        export AA_P="export PVE=\"\\033[m\\033[38;5;2m\"\$(( \`sed -nu \"s/MemFree:[\\t ]\\+\\([0-9]\\+\\) kB/\\1/p\" /proc/meminfo\` / 1024 ))\"\\033[38;5;22m/\"\$((\`sed -nu \"s/MemTotal:[\\t ]\\+\\([0-9]\\+\\) kB/\\1/p\" /proc/meminfo\`/ 1024 ))MB\"\\t\\033[m\\033[38;5;55m\$(< /proc/loadavg)\\033[m\";echo -en \"$PVE\""
        eval "$AA_P" && export PROMPT_COMMAND='history -a;(($SECONDS % 10==0 ))&&eval "$AA_P";echo -en "$PVE";' && eval "$AA_P";

        # sets up the prompt
        PS1='\[\e[m\n\e[1;30m\][$$:$PPID \j:\!\[\e[1;30m\]]\[\e[0;36m\] \T \d \[\e[1;30m\][\[\e[1;34m\]\u@\H\[\e[1;30m\]:\[\e[0;37m\]${SSH_TTY} \[\e[0;32m\]+${SHLVL}\[\e[1;30m\]] \[\e[1;37m\]\w\[\e[0;37m\] \n($SHLVL:\!)\$ ';

Well done.

Jaysunn