# htop
# Dynamic, real-time information about running processes

# Start htop.
htop

# Start htop displaying only processes owned by given user.
htop -u user_name

# Refresh every 10 seconds.
htop -d 10

# While htop(1) is running, get help about interactive commands.
?

# While htop(1) is running, invert the sort order.
I

# While htop(1) is running, trace a process with strace.
s