How to join PDF files in Mac on Terminal?

In Mac, you can use Preview to join multiple pdf files into a single pdf file. A more convenient way is to join/merge multiple pdf files from command line on Terminal. More recent Mac OS X versions already have Python script to merge multiple pdf files into a single pdf file. Here is how to […]






10 Easy Bash Shell Aliases

Aliases are great way to simplify the terminal experience. Basically an alias is a command line shortcut that allows one personalize the way one interact with Linux commands. The basic idea is to come with a simple version of your favorite command and add it to .bashrc file so that you can reuse the simple […]






11 awesome ways to use find command in Linux to search files/directory

The find command is Linux is one of the most useful commands  for searching files and directories. At first the find command syntax might look a bit daunting, but once we get a hang of it, the find command is a great asset. How to print all files and directories in current directory? find . […]






How to Run a Shell Command from Python and Get The Output?

In Python, often you may want to execute linux command and get the output of the command as string variable. Naive way to do that is to execeute the linux command, save the output in file and parse the file. A better way to get the output from executing a linux command in Python is […]






How To Set PATH variable on Bash Shell?

Have a new executable file/program? Want to execute it just by typing the name of the program instead of full path where the program is located?  The best solution is to add the path to new executable to your list of all search paths. The idea is that every time one types a command the […]






Understanding Variables in Shell Scripting

A number of beautiful and powerful programming languages, like Python, Ruby, and Perl are available for scripting needs. Even then you may find the old school unix shell scripting very useful tool to learn and use. For sure, shell scripts looks crazy and hard to read/understand. Once you get a hang of it, you might […]






How to Get a Specific Line or Lines From a Big File? Hint: Use One Liner AWK

If you are working with a huge text file with millions of lines and want to know the content of a specific line, there are a few tricks you can play to get the line you want.  The naive approach of reading the file line by line (say in python) and keeping a count on […]






Tips to Get Started with Screen, the Terminal Multiplexer

The more you feel comfortable with terminal, the higher the number of terminals that will be open. For sure you will many things to keep a tab, one for your email, one for the code, one for executing the code, and so on. And one might easily get annoyed, rightly so, recreating your multiple sessions […]






Ten Linux Commands on “tar” and “gzip” You Need to Know

Admit it. Almost every time you deal with a tar” file or “gzip” file, you wonder what was the command that I used last time to “——“. You can fill the blanks with “Creating a new tar file, how to gzip a tar file, how to unzip a file, how to get a peek of […]






How to Install Spotify in Linux?

Spotify, the digital music service, that has made listening to music more social has crossed the Atlantic ocean and landed in US. With Spotify, you dont need to buy songs any more. Instead, for a monthly subscription, the whole world of music is yours to stream to almost any device (Well almost). Needless to say […]