Tips And Tricks
When you try to ssh the another remote Linux/Unix machine , you might have encountered with the WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! . This message we have often seen when we work in Linux machines. In this post we have provided the Reason and Solution on this Warning. root@tuxworld:/tmp# ssh 10.10.0.16 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING:…
Long time ago one of my U.S system admin was very security conscious. He asked me to create id_rsa.pub key in server. I created the key with ssh-keygen -t rsa command. And send it him through encrypted email. Next day he wrote me ,what is the ssh key fingerprint ? First let’s have some introduction….
Introduction When you work on Java or any Java based project , you might need to set JAVA environment variables JAVA_HOME and PATH in Linux. After installing new java (jdk or jre) or latest Java you may have usually find that the version of java is not exactly the same which you have installed. It…
In new server today created a authorized_keys file in /root/.ssh/ directory. After doing ssh first time got the error – Agent admitted failure to sign using the key For solving this issue use the command ssh-add in client machine ssh-add Given below are the outputs from terminal. The solution pretty much straight simple. sharad@mypc:~$ ssh…
How to see system load average in terminal with graphical representation Few days back we wrote on 4 commands to find loadaverage of system. tload is the command through which we can find the loadaverage of system whereas it will show the loadaverage in Terminal with graphical representation. For more details read manpage of tload….
How to convert float to integer number In this tutorial we will learn how to convert float to integer number. This tutorial is helpful in bash or shell scripting. For eg. the float value number is 204.47584 and you would like to show only number in integer form means upto 204. So for this use…
How to download package using apt-get command in ubuntu To download the package in ubuntu with the help of command apt-get use the flag called download Note: download flag will download the given binary package into the current directory. apt-get download package-name eg. apt-get download apache2 This below given is the practical which I did…
The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form After installing the owncloud in Ubuntu Server I faced the problem, I was not able to upload the file. I was getting this error “The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form” How I solved…
In this tutorial we will learn,how to zip the directory in linux with command line.Zip is a compression and file packaging utility for Linux,Unix,Windows and various Operating system. The zip helps to compress and reduce the size of file and directory.To zip a directory,first of all we will check ,do we have zip command installed…
Learn How to change login banner message in GUI mode in CentOS 6 / RHEL 6 or above version. When user login through the GUI mode, it will see the message on Screen. In previous version of CentOS means CentOS 5.x with the help of command gdmsetup we used to change the login banner. Now…
In this tutorial we learn, how to convert rpm file into deb file.In Debian based OS like ubuntu the package file extension is .deb file. For installing the package in debian based OS we use the command dpkg -i package-name.deb . In Red Hat based linux the package file extension comes in .rpm format .(RPM…
In this tutorial,we will learn about 4 different commands to find system uptime in linux.Uptime of system means how long the server has been running and up since its last shutdown or reboot.The information about uptime is very useful in many cases it helps to audit how long the server is running and even some…
How to configure htdigest in nagios server As a security point of view I always prefer to go with htdigest rather than htpasswd method.The reason is htpaswd uses cleartext username and password whereas htdigest uses encryption method. If you have already read my post “How to configure Nagios 3.4.4 in CentOS” there I use the…
How to change smtp port number 25 in postfix Bydefault the SMTP protocol runs at port no. 25. You can change the port no. to any port no. other than below 2048. 0 to 2048 are IANA authorized known port no.but we have some other port no. also which are bydefault used by manyapplication for….
In this post we will read about curl command to check the http status. cURL is a computer software project providing a library and command-line tool for transferring data using various protocols. The cURL project produces two products, libcurl and cURL. libcurl is a free client-side URL transfer library, supporting FTP, FTPS, Gopher, HTTP, HTTPS,…