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About Maha

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July 5, 1986 (31)
About Maha
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QUEFORUM

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difference between n and endl in C++? 11-17-2014 09:55 AM
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Recent Entries

Data Structures

by Maha on 03-26-2013 at 09:40 AM
Data Structures
Using the groups of sequential data can be restrictive in C++. To avoid the sequential data there is an introduction of data structures
Data structures
A data structure is a group of data elements grouped together under one name. These data elements, known as members, can have different types and different lengths. Data structures are declared in C++ using the following syntax:
Code:
struct structname {

Datatype1 member1;
Datatype2

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Unix File security commands

by Maha on 12-19-2012 at 09:02 AM
These are the File security commands:

1)Chmod:
This command is used to change the access permissions of a file or directory. It is used to control the file and directory access by users.

Symbolic mode:
Code:
chmod[-R][who][+|-|=][mode…] filename
Absolute mode:
Code:
Chmod[-R] mode file
Before the command:

Code:
-r---w-r—test.dat
After the command:

Code:
chmod 0723 test.dat
$ls -l
-rwx

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File handling Commands:

by Maha on 12-19-2012 at 08:58 AM
1)MKDir:
This commnd is used to create a new empty directory

Syntax:
Code:
mkdir directory name
Example:

Code:
$mksdir dir1 dir2 dir3
Code:
$mkdir hello
2)cd command:
This command is used to change the working directory to the directory

Syntax:
Code:
cd directory name
Example:
Code:
$cd hello
3)rmdir:
This command is used to remove the required directory. This remove directory

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Linux Sar Command to Monitoring the performance of the CPU

by Maha on 11-15-2012 at 11:24 AM
Linux Performance Monitoring and Debugging Tools

1. SAR
Sar is the utility used to monitor system real time performance (CPU, Memory, I/O, etc) and is used to Collect performance data in the background on an on-going basis and do analysis on the historical data to identify bottlenecks.
This utility is a part of the sysstat package.

By using sar utility we can do the following activities.
We can find the Collective CPU usage
Possible to

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Memory Management, Virtual Memory and Demand Paging in Linux

by Maha on 11-15-2012 at 10:54 AM
Memory Management, Virtual Memory and Demand Paging in Linux

Managing the memory is one of the most important activity done by Linux kernel.

In this article we will try to explain the basics of virtual memory and demand paging.

virtual memory and demand paging are the two important concepts in the memory management.

Virtual Memory

This is one of the important feature of memory management. In the early stages of computers

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