Tips And Tricks
error: could not configure a c compiler It is the most common error found while installing the package from its source code. Many times I got this issue while working in CentOS and Red Hat Actually the source code has some scripts which require C compiler as the code is written in C language. If…
In this tutorial we will configure the additional ethernet in CentOS. The practical has been done in Virtual box whereas it is also applicable to physical machines. Scenario: In Virtual Box,we have only one ethernet or NIC card (eth0) while installing the CentOS.Later we added one more ethernet(eth1) but when we were using command ifconfig…
Korn shell or ksh is another Unix shell like bash,sh and csh. Korn shell was developed by David Korn at Bell Labs in the early 1980s and announced at USENIX on July 14, 1983. Many Unix based operating system like AIX,BSD etc. they already have ksh preinstalled. The AIX by default uses the ksh. To…
In this post we will learn how to use php to get the visitor’s IP address in a webpage.This code also helps Network or system admin to know from which IP he is using currently. For eg. your company have 2 public IP from different ISP and both are in failover. The companies network is…
In this post we will read about how to release renew dhcp assigned ip address in linux. In Windows for releasing and renew of DHCP assigned IP, we use the command ipconfig /release ipconfig /renew How to release the DHCP assigned IP in linux. The below command will be applied to all interfaces which are…
While installing the python module I got this error ,”error command ‘gcc’ failed with exit status 1 ” To solve this issue install python-dev package sudo apt-get install python-dev Now recheck,I hope the problem is solved now.
Swap space can be a dedicated swap partition , a swap file or a combination of swap partitions and swap files. In this article, we will learn to find swap partition or swap file in the Linux Operating System. Methods to find the swap partition / file The given below are the mostly used methods…
In this post, learn how to convert video file into gif file through command line in linux. For converting the video file into gif file there are many methods. We tried most of the methods. We used some software package like mplayer and image-magick. Image-magick has one issue that is related to memory allocation. With…
configure: error: C++ compiler cannot create executables This kind of error generally comes when you are installing the package from source code. The source code have many C or C++ files which require C compiler. To solve this issue in CentOS and Red Hat ,run the below given command. Here we are using wildcard *…
In this post we will learn about how to set date and time as well as how to get date and time information with date command.Note: If you want to set date and time of system you must be login with superuser or root. Date command is one of the useful command in linux. At…
Change default editor of crontab in Ubuntu When you first time open the crontab with command crontab -e it will ask you to set the default editor. In this tutorial we will see how to set default editor of crontab as well as how to change it to other default editor. I usually work with…
send email after mysql backup through bash script in simple way In Facebook group one of the user asked this question “how to send email after mysql backup through bash script”. If you know bash scripting a bit it is just a one liner. It can be write in more advanced form but here I…
Allow wget in iptable Today when I was trying to do wget from my server I found it did not allow me to do it. Then I check with yum command also and found the error message “Couldn’t resolve host ‘some.domainname.com'”. It seems the iptables rule in Server is not allowing to wget and yum….
We purchased some server in Digital Ocean and found the w00tw00t.at.blackhats.romanian.anti-sec attack. The same kind of attack we also found in our AWS EC2 servers. w00tw00t.at.blackhats.romanian.anti-sec is kind of script attack in which attacker try to find the loopholes in phpmyadmin and php with Apache and try to manipulate through URL.The same thing I found…
How to create a file with cat command Cat command has many use , in my earlier post I wrote about how to see line no. in file with cat command In this example I will guide how simply you can also create a file and write content in it. Steps to follow In this…