SYSTEM UTILITIES
Features:
1. Process listing
2. Free/available memory
3. Disk utilization
1. ps - process status/listing
ps -ef or ps -aux
2. top - combines, ps, uptime, free and updates regulary
3. uptime - returns useful system utilization information:
a.current time
b. uptime - days, hours and minutes
c. connected users
d. load averaged - 1,5,15 minute values
4. free - returns memory utilization
a.RAM
b.SWAP
c.free -m - for human readable format
5. df - returns disk partition/mount point information
a.df - returns info. using kilobytes
b.df -h - returns info. using megabytes/human readable (gigs/teray/etc.)
6. vmstat - reports on: processes, memory, paging, block I/O, traps, CPU activity
a.vmstat
b.vmstat -p /dev/hda1 - returns partitions stats for /dev/hda1 (/boot)
7. gnome-system-monitor - GUI, combining most system utilities
8. ls -ltr /proc
a.cat /proc/cpuinfo
9. kill PID - kills the process with a given PID
10. runlevel - returns runlevel information using 2 fields:
a.represents previous runlevel
b.represents current runlevel
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