The Free command is
only of the mostly used command in linux system. It displays amount of free and
used memory in the system.
When you execute the
free command like, it gives the details of the memory as well as the
information about the buffer, shared and cached also.
[root@vx111a ~]#
free –m (m option shows the memory in MB)
total
used ...
Friday, August 31, 2012
Wednesday, August 29, 2012
Auditing in Linux
There
are cases for an admin, where he needs to identify various operations
performed on a file, or number of commands a particular user has
executed. Linux provides the auditing facilities for these sorts of
operations. Linux Kernel (2.6.x) comes with audit daemon. It’s
responsible for writing audit records to the disk much like logs
information when a specific thing happens.
To
Find Whether audit was already installed...
Tuesday, August 28, 2012
Run a Process On Specific Processor In Linux
Many Times,
there will be a need of multiple processors on a server system to provide better
performance and availability. When we use more processors, a subset of these
can be made available to specific applications. This can be useful for some
applications which are highly timing-sensitive, or when it is desired otherwise
that an application always have one or more processors available to it. In Linux,
it is possible to effectively...
Monday, August 27, 2012
More DU Commands
Here are a list of 'du' commands that i use in my daily work.These will be updated regularly.
du
-sh * | sort -n | tail
Get the 10 Biggest Files
du
-hs */
List
Complete Size Of Directories
du
-sh ./* | sort -nr
Disk Usage Command Sorted
by Size
du
-sh
Sum
File Sizes
du
-ms * | sort -nr
Sort all Files Rounded to
the Nearest...
Friday, August 24, 2012
Linux Environment Variable
An
environment variable is a named object that contains data used by one or more
applications. In simple terms, it is a variable with a name and a value. The
value of an environmental variable can for example be the location of all
executable files in the file system, the default editor that should be used, or
the system locale settings. Environment variables in Linux are used by most of
the activities taking place on a Linux...
Process Based Commands
Some
Process Based Commands (Updated Regularly)
List the Process
based on the UID and Commands
ps -f -u
wwwrun,postfix
List process based
on Commands
ps -aux | grep
command
or
ps -f -C
run.pl (find Process by run.pl)
List the processes
based on PIDs or PPIDs
ps -f --ppid
List Processes in a
Hierarchy
ps -e -o pid,args –forest
Get Details of the
Process...
Process In Linux
A
Process is a running instance of a program. So whenever we start something,
there is a process associated with that. If you have two files opened on your
window, then we have 2 process belonging to those files available. A process
started will contain all of its variables and also states.
The CPU
runs switches from one process to other process making the user think that it
is running multiple processes at a time, but...
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