More Linux system commands

Tool   Most useful tool function
top- Process activity
vmstat- System activity. Hardware and system information
uptime,w- Average system load
pe. pstree- Displays the processes
free- Memory usage
iostat- Average CPU load. desk activity
sar- Collect and report system activity
mpstat- Multiprocessor usage
numastat- NUMA-reLated statistics
pmap- Proces, memory usage
netstat- Network statistics
iptraf- Realtime network statistics
tcpdump. ethereal- Detailed network traffic analysis
nmon- Collect and report system activity
strace- System calls
Proc file system- Various kernel statistics
KDE system guard-  Real-time systems reporting and graphing
Gnome System Monitor-  Real-time systems reporting and graphing