Red Hat Linux Common commands

1. Check the machine model

 
[[email protected] ~]# dmidecode | grep "Product Name"
        Product Name: VMware Virtual Platform
        Product Name: 440BX Desktop Reference Platform

2. Query the Linux distribution version

 
[[email protected] ~]# cat /etc/issue | grep Linux
Red Hat Enterprise Linux Server release 5.5 (Tikanga)

3, query network card information

 
[[email protected] ~]# dmesg | grep -i eth
e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection
e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
eth0: no IPv6 routers present

4. View memory Information

[[email protected] ~]# cat /proc/meminfo 
MemTotal: 2057360 kB
MemFree: 1145252 kB
Buffers: 35588 kB
Cached: 641836 kB
SwapCached: 0 kB
Active: 334412 kB
Inactive: 501312 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 2057360 kB
LowFree: 1145252 kB
SwapTotal: 2096440 kB
SwapFree: 2096440 kB
Dirty: 2308 kB
Writeback: 0 kB
AnonPages: 158340 kB
Mapped: 70468 kB
Slab: 35288 kB
PageTables: 14076 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 3125120 kB
Committed_AS: 1578184 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 264052 kB
VmallocChunk: 34359473911 kB
HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB

5. View disk Information

[[email protected] ~]# fdisk -l

Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14        2350    18771952+  83  Linux
/dev/sda3            2351        3655    10482412+  83  Linux
/dev/sda4            3656        3916     2096482+   5  Extended
/dev/sda5            3656        3916     2096451   82  Linux swap / Solaris

Disk /dev/sdb: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         261     2096451   83  Linux

Disk /dev/sdc: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1         261     2096451   83  Linux

Disk /dev/sdd: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               1         261     2096451   83  Linux

Disk /dev/sde: 6442 MB, 6442450944 bytes
255 heads, 63 sectors/track, 783 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sde1               1         783     6289416   83  Linux

Disk /dev/sdf: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdf1               1         522     4192933+  83  Linux

Disk /dev/sdg: 6442 MB, 6442450944 bytes
255 heads, 63 sectors/track, 783 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdg1               1         783     6289416   83  Linux

Disk /dev/sdh: 6442 MB, 6442450944 bytes
255 heads, 63 sectors/track, 783 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdh1               1         783     6289416   83  Linux

6. Viewing mounted partitions

[[email protected] ~] # df -lh
File System Capacity Used Available Used% Mount Point
/ dev / sda2 18G 15G 2.5G 86% /
/ dev / sda3 9.7G 3.2G 6.1G 34% / tmp
/ dev / sda1 99M 15M 80M 16% / boot
tmpfs 2.0G 156M 1.9G 8% / dev / shm 

7. View IP Address

[[email protected] ~]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:0C:29:66:A7:7A  
          inet addr:192.168.163.200  Bcast:192.168.163.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe66:a77a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2764 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1315 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:423897 (413.9 KiB)  TX bytes:226241 (220.9 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4205 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4205 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2593323 (2.4 MiB)  TX bytes:2593323 (2.4 MiB)

sit0      Link encap:IPv6-in-IPv4  
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)