Understanding Each Column in Linux File Listing

Understanding Each Column in Linux File Listing

 

Note: File permission can be divided in to 4 parts

For File

-|rw-|r--|r--|

For Directory

d|rwx|r-x|r-x|

1. Shows the File permissions.

• The first character indicates whether is it is a file or Directory, if it is starts with “-” then it is a file and if it starts with “d” then it is the directory.
• The Second set of the three characters represent the read, write, and execution rights of the file’s owner.
• The Third set of the three characters represent the read, write, and execution rights of the file’s Group.
• The Fourth set of the three characters represent the read, write, and execution rights of the everybody else.

2. Owner.

• Name of the user who owns the file.

3. Groups

• The Name of the group that has file permission in addition to the file’s owner.

4. Size

• The Size of the file in bytes.

5. Modification Time

• The last time the file was modified. If the last modification occurred more than six months in the past, the date and year are displayed. Otherwise. The time of the day is shown.

6. File name

• The Name of the File or Directory.

LINUX SERVER ADMINISTRATOR: RHEL 6.0 Installation Hardware Requirements

LINUX SERVER ADMINISTRATOR: RHEL 6.0 Installation Hardware Requirements:   1. CPU/Architecture Requirements o It runs on X86_64 Architecture o 64 bit Systems are required. o Supporting CPU Architecture Ø X86 ...

RHEL 6.0 Installation Hardware Requirements

 

1. CPU/Architecture Requirements

o It runs on X86_64 Architecture

o 64 bit Systems are required.

o Supporting CPU Architecture

Ø X86 (32-Bit)

Ø Intel/AMD64 (X86_64)

Ø IBM Power Architecture (64bit)

Ø IBM Systems Z Architecture

Command to check the architecture of the system

#uname –p

Example :

[root@localhost ~]# uname -p
x86_64

To check Configuration that supports Hardware assisted Virtualization

[root@localhost ~]# cat /proc/cpuinfo
processor             : 0
vendor_id             : AuthenticAMD
cpu family            : 16
model                 : 6
model name        : AMD Athlon(tm) II X2 250 Processor
stepping              : 2
cpu MHz            : 3018.153
cache size         : 1024 KB
fpu                     : yes
fpu_exception    : yes
cpuid level         : 5
wp                    : yes
flags                 : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow constant_tsc rep_good tsc_reliable nonstop_tsc unfair_spinlock pni cx16 popcnt hypervisor lahf_lm extapic abm sse4a misalignsse 3dnowprefetch
bogomips         : 6027.41
TLB size          : 1024 4K pages
clflush size       : 64
cache_alignment    : 64
address sizes    : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate
processor       : 1
vendor_id       : AuthenticAMD
cpu family       : 16
model            : 6
model name    : AMD Athlon(tm) II X2 250 Processor
stepping        : 2
cpu MHz        : 3018.153
cache size    : 1024 KB
fpu                : yes
fpu_exception    : yes
cpuid level         : 5
wp                 : yes
flags               : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow constant_tsc rep_good tsc_reliable nonstop_tsc unfair_spinlock pni cx16 popcnt hypervisor lahf_lm extapic abm sse4a misalignsse 3dnowprefetch
bogomips       : 6027.41
TLB size        : 1024 4K pages
clflush size     : 64
cache_alignment    : 64
address sizes    : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

Note: If you find vmx for Intel and svm for AMD, under flags then it supports Hardware assisted Virtualization.

 

2. RAM Requirements:

Officially requires 512 MB RAM

Recommended 1GB RAM per system.

For VM’s running without GUI mode needs less than 512 MB RAM

On 32 bit system maximum RAM supported is 16GB

On 62 bit system maximum RAM supported is 2TB

 

3. Hard drive Requirements:

Supports PATA, SATA and SCSI

Supports attachments up to 31 different SCSI Hard drives.

Can configure 16 SATA Drives on Systems