linux Archive

Linux FTP

By
admin
 – December 14, 2009Posted in:

Usage of File Transfer Protocol(ftp) in Linux

File Transfer Protocol(FTP) in Linux exists in Internet from 1971 and broadly used in operating systems such as Linux. There is lot of changes in the Clients and Users who use this protocol and there are different ways in which this protocol is developed. There are different types of ftp that are available in Redhat. Some of them are original ftp, command-line ftp and graphical clients like gftp and scp which uses ftp and sftp. So there should be controlled access to ftp from the users to upload aswell as download a file from Linux and it should be properly organized.

Improving Security for ftp

Security is the most crucial part for any company and there needs a good amount of security for the data. Some companies only need users to access the data with username and password so that a proper idea for the downloads can be known to the administrator.

Article about Linux-Server-management-via-FTP which was very informative and useful and it provides good amount of information about how to control access to ftp. The information about performing anonymous access and enabling and disabling users to control over files is very informative.

One of the other articles which was very useful was regarding choosing best tool for application compatibility issues which provided details about the program compatible trouble shooter and program compatible assistant and much more. This article gave a brief idea of trouble shooting in windows xp environment.

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tcpdump command

By
admin
 – August 26, 2009Posted in:

Unix Command of the Day

This technical article is about tcpdump command in unix which is used extensively in linux and unix. tcpdump provides information about data that is received in machine and port.
Today’s Unix Command of the Day is tcpdump

tcpdump in unix

tcpdump in Unix is a very popular command

tcpdump – dump traffic on a network

tcpdump

Tcpdump prints out a description of the contents of packets on a network
interface that match the boolean expression. It can also be run with the -w
flag, which causes it to save the packet data to a file for later analysis,
and/or with the -r flag, which causes it to read from a saved packet file
rather than to read packets from a network interface. In all cases, only
packets that match expression will be processed by tcpdump.

Tcpdump will, if not run with the -c flag, continue capturing packets
until it is interrupted by a SIGINT signal (gener- ated, for example,
by typing your interrupt character, typically control-C) or a SIGTERM
signal (typically generated with the kill(1) command); if run with the -c
flag, it will capture packets until it is interrupted by a SIGINT or
SIGTERM sig- nal or the specified number of packets have been processed.

If you want to check for a particular port in a machine

then command is

tcpdump port

If you want to check for a particular ip in a machine
then command is

tcpdump host

Hope this linux command is useful for your programming. good luck

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How to change file modification date in linux

By
admin
 – July 25, 2009Posted in:

if your system date is far front than the files that are copied in to your system, you have to modify the file date . for file modification in linux, it is very simple

use touch *.
It will modify the date and time of all the files in the current directory.

If you have multiple files and directories,

you have to use find command in unix in that particular directory

find . -name “*.*”|xargs touch *

This command will change the file modification date and so everthing will be fine

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