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System Utilities

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


About Ali abdo

Ali 32 years old from Egypt working as system engineer riding motorcycle to Support and develop Egyptian tourism, spread motorcycling.

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