********* simple selection ********* ********* selection by list *********
-A all processes -C by command name
-N negate selection -G by real group ID (supports names)
-a all w/ tty except session leaders -U by real user ID (supports names)
-d all except session leaders -g by session OR by effective group name
-e all processes -p by process ID
T all processes on this terminal -s processes in the sessions given
a all w/ tty, including other users -t by tty
g OBSOLETE -- DO NOT USE -u by effective user ID (supports names)
r only running processes U processes for specified users
x processes w/o controlling ttys t by tty
*********** output format ********** *********** long options ***********
-o,o user-defined -f full --Group --User --pid --cols --ppid
-j,j job control s signal --group --user --sid --rows --info
-O,O preloaded -o v virtual memory --cumulative --format --deselect
-l,l long u user-oriented --sort --tty --forest --version
-F extra full X registers --heading --no-heading --context
********* misc options *********
-V,V show version L list format codes f ASCII art forest
-m,m,-L,-T,H threads S children in sum -y change -l format
-M,Z security data c true command name -c scheduling class
-w,w wide output n numeric WCHAN,UID -H process hierarchy
3)nice - run a program with modified scheduling priority
4)kill - terminate a process
My personal reference for routine system admin tasks and also helps for RHCSA and RHCE exams.
Friday, August 5, 2011
top, ps, nice and kill on CentOS/RHEL 6.0
Identify CPU/memory intensive processes, adjust process priority with renice, and kill processes
What is a Process?
A process is a set of instructions loaded in to memory. A process usually has a Process ID (PID) .
For this purpose, we use top, ps, nice and kill command.
1) top - display Linux tasks
2)ps - report a snapshot of the current processes
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