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Get the current cpu % usage on your system.
top accecpts a comma separated list of PIDs.
Like command 10870, but no need for sed
may return several pids for process foobar footy01 etc. like this:
sed puts "-p " in front and we pass a list to top:
top -p 11427 -p 12576 -p 12577
You can also use different process using comma: top -p `pgrep pidgin`, `pgrep python` but you have to make sure the process exists or you'll get an error
Show only specific process id's using Top
An advanced possibility to count the lines of code like in #8394
usage: top -hv | -bcisSHM -d delay -n iterations [-u user | -U user] -p pid [,pid ...]
Of course, the httpd can be replaced with any other process name
I found Flash eating one of my CPUs after resume, the command above will help with that. For optional kicks you can put it into a script in /etc/pm/sleep.d/ (aspect in #swhack wrote this for me)
running top command in batch mode. it is usefull if you want to redirect the output in a file.
This command starts screen with 'htop', 'nethogs' and 'iotop' in split-screen. You have to have these three commands (of course) and specify the interface for nethogs - mine is wlan0, I could have acquired the interface from the default route extending the command but this way is simpler.
htop is a wonderful top replacement with many interactive commands and configuration options. nethogs is a program which tells which processes are using the most bandwidth. iotop tells which processes are using the most I/O.
The command creates a temporary "screenrc" file which it uses for doing the triple-monitoring. You can see several examples of screenrc files here: http://www.softpanorama.org/Utilities/Screen/screenrc_examples.shtml
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.
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.)