Thamasoma Jyotirgamaya

Version of Ubuntu is installed.?

2009-02-10T05:35:00.000-08:00

How to know, the release version of Ubuntu installed in your system..?

$lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 8.10
Release: 8.10
Codename: intrepid

Installed package version.

2009-02-10T05:32:00.000-08:00

How to know the Installed version of the particular package in debian..?

You can use the following command...
apt-cache show

That will list the version information.

Useful gdb commands

2008-06-04T06:20:00.000-07:00

The following will be useful for the GDB..

(gdb) disassem
(display memory as machine instructions)
(gdb) info frame
(describe current frame or frame at [addr])

Check availability of a Socket.

2008-06-03T02:07:00.000-07:00

To check whether a particular port is available or not, we can use

1) netstat -a
{ if you are in the same computer, it will list all the ports it is listening, and all the connections established. }

2) nmap
{ if you are checking from a remote system, whether a particular port is available.}

stinbng51:/home/nthattil# nmap -sU -p 4343 x.x.x.x

Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) at 2008-06-03 14:25 IST
Interesting ports on stinbng46 (x.x.x.x):
PORT STATE SERVICE
4343/udp open|filtered unicall
MAC Address: 00:1E:C9:AD:4F:DE (Unknown)

Nmap finished: 1 IP address (1 host up) scanned in 0.473 seconds
stinbng51:/home/nthattil#

How to get list of installed softwares in Debian/Ubuntu System

2008-01-22T00:29:00.000-08:00

The command
        $ dpkg --get-selections
would list all the installed programs in your debian system.

Unlock the Installation Lock Ubuntu/debian

2008-01-14T06:47:00.000-08:00

E: Could not get lock /var/cache/apt/archives/lock - open (11 Resource temporarily unavailable)

It says that a lock file preventing your package manager from getting exclusive access. Package managers create these lock files when they starts and if they crash, you reboot, your power goes out, etc, before they are completed, the lock file remains and the next manager believes another manager is already running

sudo rm /var/lib/dpkg/lock

sudo rm /var/cache/apt/archives/lock

Enable MACRO in GDB

2008-01-14T03:13:00.000-08:00

How to Enable MACRO support in GDB..?

compile your source code using the options -gdwarf-2 -g3,

gcc -gdwarf-2 -g3

then in gdb prompt, you can issue commands

macro expand expression

for more information, you can go here

How to know the Linux Distribution Name of your machine?

2008-01-14T02:39:00.000-08:00

To get simply the OS kernel version you can use the command uname -a

nthattil@nthattil-desktop:~$ uname -a

Linux nthattil-desktop 2.6.22-14-generic #1 SMP Tue Dec 18 08:02:57 UTC 2007 i686 GNU/Linux

But how to know the distribution..?

You can try one of the below given methods for that..
nthattil@nthattil-desktop:~$ cat /proc/version

Linux version 2.6.22-14-generic (buildd@terranova) (gcc version 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)) #1 SMP Tue Dec 18 08:02:57 UTC 2007

To get more presided output, you can use,
nthattil@nthattil-desktop:~$ cat /etc/issue.net
Ubuntu 7.10

Or you can also use,
nthattil@nthattil-desktop:~$ dmesg | head -1

[ 0.000000] Linux version 2.6.22-14-generic (buildd@terranova) (gcc version 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)) #1 SMP Tue Dec 18 08:02:57 UTC 2007 (Ubuntu 2.6.22-14.47-generic)