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A simple but effective replacement for ps aux. I used to waste my time running ps over and over; top is the way to go. It also allows complex sorting options. Press q to exit "nicely" (Ctrl + C is always an option, of course). Note that the list updates each second, resorting in the process; if you're trying to grab a specific PID, you might be better off with ps.
htop
Alternatively, htop is available, though it may not come pre-installed. htop is slightly more interactive than top and includes color coding, visuals, and a nice interface for selecting and then killing processes. (Thanks to bwoodacre for this great tool.)
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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top is good. These days (under linux) I like htop more.
Top has a nifty bunch of commands.
Type "?" to see the list.
"c" toggles command / command line (fu++ :-)
I love that alternative, bwoodacre; I just yum'd it. I'm going to edit it into the description. I doubt I'll ever type "top" again. ;)
Try htop also.
waltharius: Yes, that's listed as an alternative. Many Linux systems do not have htop/vtop installed by default, however.
Top doesn't always cut it for me. I find myself using 'ps' and 'pstree' a lot (with various options that depend on what I'm looking for. If I'm in Slackware, I sometimes use 'socklist'...a similar command in the BSD world is 'sockstat'.