juretta.com

Shell sysadmin oneliner | January 15, 2006-->

January 15, 2006

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

@18:09 | Comments: 0 | Tags: Shell (2), Unix (14)