System Utilities

###System Utilities###

Features:

1. Process listing

2. Free/available memory

3. Disk utilization

1. ps - process status/listing

a. 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

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