System Monitoring Commands

df, top, dmesg, iostat 1, netstat, free, top

Command
top	System Utility command that gives you system performance information
df
dmesg	Used to examin or control the ring buffer.
iostat	Check different read and write speed of i/o peripherals.
netstat
free	Memory Info
cat /proc/cpuinfo	All CPU info
cat /proc/meminfo	Memory Info