Shell sysadmin oneliner
January 15, 2006
Shell
Unix
Show memory usage:
stefan@www:~$ free -m
total used free shared buffers cached
Mem: 6051 5998 53 0 586 2187
-/+ buffers/cache: 3224 2826
Swap: 12291 5327 6964
Detailed memory usage
stefan@www:~$ cat /proc/meminfo
MemTotal: 515476 kB
MemFree: 244008 kB
Buffers: 43628 kB
Cached: 115136 kB
SwapCached: 0 kB
Active: 144876 kB
Inactive: 81144 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 515476 kB
LowFree: 244008 kB
SwapTotal: 1048568 kB
SwapFree: 1048568 kB
Dirty: 124 kB
Writeback: 0 kB
Mapped: 74624 kB
Slab: 40884 kB
Committed_AS: 122000 kB
PageTables: 940 kB
VmallocTotal: 499704 kB
VmallocUsed: 2612 kB
VmallocChunk: 496648 kB
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 4096 kB
Show average load
stefan@www:~$ cat /proc/loadavg
0.00 0.00 0.00 1/51 3969
Show how long the system has been running:
stefan@www:~$ uptime
18:10:14 up 328 days, 19:37, 1 user, load average: 0.46, 0.32, 0.17
Print system information:
stefan@www:~$ uname -a
Linux www.juretta.net 2.4.20-021stab022.11.777-enterprise #1 SMP Fri Jan 14 11:07:01 MSK 2005 i686 GNU/Linux
Listing a disk's free space:
stefan@www:~$ df -h /
Filesystem Size Used Avail Use% Mounted on
- 1.5G 954M 583M 63% /
Listing a file's disk usage
stefan@www:~$ du -h --summarize /home/
191M /home/
Who's doing what
stefan@www:~$ w
01:14:06 up 127 days, 16:06, 2 users, load average: 0.08, 0.08, 0.04
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
elephant pts/1 195.234.128.239 19:27 48.00s 0.23s 0.23s -bash
sts pts/3 h-213.61.139.198 01:07 0.00s 0.02s 0.00s w