LinuxCommands

Overview

This article describes several linux user space commands that can be useful for doing several tasks

System Information

arch: Show the machine arch.

uname -m: Show machine arch.

[jdoe@localhost ~]$ arch

x86_64

[jdoe@localhost ~]$ uname -m

x86_64

uname -r: Show the kernel version.

cat /proc/version: Show kernel version (extra information).

[jdoe@localhost ~]$ uname -r

3.11.10-301.fc20.x86_64

[jdoe@localhost ~]$ cat /proc/version 

Linux version 3.11.10-301.fc20.x86_64 (mockbuild@bkernel01.phx2.fedoraproject.org) (gcc version 4.8.2 20131017 (Red Hat 4.8.2-1) (GCC) ) #1 SMP Thu Dec 5 14:01:17 UTC 2013

dmidecode -q: Show the system hardware information.

[root@localhost ~]# dmidecode -q

hdparm -i /dev/hda: Show harddisk information.

hdparm -tT /dev/sda: Do a read test.

cat /proc/cpuinfo: Show CPU information.

[root@localhost ~]# cat /proc/cpuinfo 
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 58
model name	: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
stepping	: 9
microcode	: 0x15
cpu MHz		: 2891.250
cache size	: 4096 KB
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf eagerfpu pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt aes xsave avx f16c rdrand hypervisor lahf_lm ida arat epb xsaveopt pln pts dtherm fsgsbase smep
bogomips	: 5782.50
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

cat /proc/interrupts: Show Interrupts information.

cat /proc/meminfo: Show Memory Information.

[root@localhost ~]# cat /proc/meminfo 
MemTotal:        1012292 kB
MemFree:           95564 kB
Buffers:           15064 kB
Cached:           279516 kB
SwapCached:          120 kB
Active:           561972 kB
Inactive:         223432 kB
Active(anon):     426008 kB
Inactive(anon):    67376 kB
Active(file):     135964 kB
Inactive(file):   156056 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       2097148 kB
SwapFree:        2097028 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:        490736 kB
Mapped:            98116 kB
Shmem:              2560 kB
Slab:              61860 kB
SReclaimable:      27452 kB
SUnreclaim:        34408 kB
KernelStack:        2568 kB
PageTables:        20212 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     2603292 kB
Committed_AS:    1688032 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      171764 kB
VmallocChunk:   34359537536 kB
HardwareCorrupted:     0 kB
AnonHugePages:     92160 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       75648 kB
DirectMap2M:      972800 kB

cat /proc/swaps: Show swap files.

cat /proc/net/dev: Show Network adapters and statistics.

cat /proc/mounts: Show mounted volumes in the system.

lspci -tv: Show PCI devices.

lsusb -tv: Show USB devices.

date: Show the system date.

cal 2014: Show calendar <cal + year>

cal 07 2014: Show month.

date 041217002011.00: set date (set, adjust) date y hour.

clock -w: Save date changes in BIOS.

<tt>[jdoe@localhost ~]$ arch</tt> <tt>x86_64</tt> <tt>[jdoe@localhost ~]$ uname -m</tt> <tt>x86_64 </tt>