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How to delete environment variables in SUN Solaris
I had written an article previously on how to set the environment variables in Linux/Unix system. You may want to have a look it here. Let’s see how we can delete the variables in the SUN Solaris...
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How to resolve Oracle Error “shared memory realm does not exist”
This is one of the most commonly observed error in Oracle database. The exact error description is as follows: ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist SUN...
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How to remove the backspace ^H character from Unix session
While typing commands on a unix system, removing a miss-typed character by the backspace writes down a character ^H instead. To remove a character, you must use Ctrl+BackSpace instead. However, this...
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How to run SQL commands with an input variable
This post will guide you how you can play with SQL using the interactive variable values inside the statement. To begin with, suppose we even don’t know which table we want to query from. To check all...
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How to get rid of scrolling for long SQL output in Oracle
For large output which is not able to fit in a single window, scrolling the results can skip data while it looks messy as well. to get rid of scrolling, you can use the command “set pause on”. With...
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All you need to know about Crontab
A crontab contains entries for a cron job. Entries in the crontab are separated by newline characters. Each crontab contains six fields separated by spaces as shown below: Minute Hour Day Month...
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Understanding background and foreground jobs in Linux
The background processes in Linux refer to the processes running in the background for a particular session which foreground processes are the ones which are currently being operated upon. The...
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How to modify the timestamp of files in Linux
touch command is used to modify the timestamps of the file. Suppose, you want to modify the time stamp of the file top.txt, use the command as follows: linux:~ # ls -l top.txt -rw-r–r– 1 root root...
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How to access internet from VMWARE (Linux)
Having difficulty in connecting to internet from VMware? Recently I installed CentOS in the VMWARE for configuration purposes. I thought it would be beneficial to share how to connect to internet via...
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How to install Python on CentOS
Enthusiastic about python? Well, this language has been gaining popularity. Only 2 commands & you will be set to go. $ yum groupinstall “Development tools” $ yum install zlib–devel bzip2–devel...
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