Linux Command for Process Management and Network Monitoring

linus_process_management

# List all processes dynamically, q to close top, k to kill a process
top

# Displays processes in tree format
pstree

# Display all running processes owned by the current user
# ps aux

# Find a process
ps aux | grep process

# Terminate a process with PID
# The -9 will violently ensure "execution".
kill -9 pid

# Terminate all process with a particular name
killall -9 process

# Change the nice value of an already running process.
# The nice value determines what priority the process runs with.
# A value of -19 is very high priority, while a value of 19 is very low priority.
# A value of 0 is the default priority.
renice 19 pid

# Monitor network packets
tcpdump -A -i eth0 tcp # capture at tcp level
tcpdump -n -i eth0  # capture at tcp level
tcpdump -n -i eth0  # capture at tcp level
tcpdump -i eth0 src 192.168.0.2 # from source ip
tcpdump -i eth0 dst 50.116.66.139 # from destination ip

# Who is logged on and what they are doing 
w

# List open files
Lsof