– To see the zombie process
# ps aux | awk ‘{ print $8 ” ” $2 }’ | grep -w Z
– To list the running processes
# ps -r
– Processes for a particular user
# ps -U apache
# ps U apache
# ps -u apache
– To view processe owned by current user.
# ps U $USER
– To print a stack trace of a running process.
# pstack 1691
#0 0x00ef7424 in __kernel_vsyscall ()
#1 0x00649623 in __waitpid_nocancel () from /lib/libc.so.6
#2 0x08082ec2 in ?? ()
#3 0x080840ee in wait_for ()
#4 0x08074515 in execute_command_internal ()
#5 0x08074684 in execute_command ()
#6 0x08060797 in reader_loop ()
#7 0x0805fe19 in main ()
– To lit process with the virtual memory format
# ps v
– To display a tree of processes.
# pstree
– pgrep, pkill – look up or signal processes based on name and other attributes
# pgrep 1234
# pkill 1234 OR # pkill httpd
– To find top processes using memory
# ps -eo pid,rss,comm –sort rss
– Top 10 processes consuming more memory
# ps ax -o rss,command | sort -nr | head -n 10
# ps ax -o rss,user,command | sort -nr | head -n 10
# watch -n 2 ‘ps ax -o rss,user,command | sort -nr | head -n 10’
– To list the processes which has tatad.pl in its command execution.
# ps -f -C tatad.pl
– List the processes based on PIDs
# ps -f –ppid 9576
– To list the process hierarchy
# ps -e -o pid,args –forest
# ps axjf
# ps -ejH
– To list elapsed wall time for processes
# ps -p 1,29675 -o pid,etime=
– List all threads for a particular process
# ps -C java -L -o pid,tid,pcpu,state,nlwp,args
– To find the memory leak, fire below command
# ps aux –sort pmem
– We can customize the output using the -o option.
– To list the memory usage periodically
# free -m -s 5
# free -t -m
# vmstat 5
– Sorting processes by memory
# ps aux | awk ‘{print $4″t”$11}’ | sort | uniq -c | awk ‘{print $2″ “$1” “$3}’ | sort -nr
# ps aux –sort -rss | head -n 10
# ps ef -o command,vsize,rss,%mem,size
# ps -e -orss=,args= | sort -b -k1,1n
# ps aux | sort -nrk 4 | head -10
# top -n 1
# ps -eo pmem,pcpu,rss,vsize,args | sort -k 1 -r | more
# ps -e -orss=,size=,args= | sort -b -nr
– To know memory map of a process
# pmap -x 1232
– To get the process start time
# ps -p PID -o lstart=
– To kill the process
# kill -9 PID ( sends a process a SIGKILL signal)
– The kill command allows a user to send signals to processes. ( It is nothing but sending signals to processes.)
– A process can be sent a SIGTERM signal in four ways (the process ID is ‘1234’ in this case):
kill 1234
kill -s TERM 1234
kill -TERM 1234
kill -15 1234
– The process can be sent a SIGKILL signal in three ways:
kill -s KILL 1234
kill -KILL 1234
kill -9 1234
– Typing certain key combinations at the controlling terminal of a running process causes the system to send it certain
signals:
Ctrl-C sends an INT signal (SIGINT); causes the process to terminate.
Ctrl-Z sends a TSTP signal (SIGTSTP); causes the process to suspend execution.
Ctrl- sends a QUIT signal (SIGQUIT); causes the process to terminate and dump core.
– Variations for sending -9 signal.
# kill -s SIGKILL 1414
# kill -s KILL 1414
# kill -s 9 1414
# kill -SIGKILL 1414
# kill -KILL 1414
– To list all signalks from the linux enviroment.
# man -k signal | grep list
– To kill a background job.
# kill %1
– To kill more than one process
# kill pid1 pid2 pid3 pid4…..
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