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 […]






How to Fold a Long Single Line Text to Multiple Lines (in Python and Linux)?

You might want to convert a really long string in a single line into multiple lines with specified width. For example, if you have string like 12345678912345678912345678912345678912345678910 and want to split the long text to multi-line text, where each line is of length w, like w=9 123456789 123456789 123456789 123456789 123456789 10 In the above […]






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 . […]






Bash tip: Search through history using the up and down arrows

Ctrl-R is one of the most useful commands on the terminal and it allows to browse through command history and re-use it again. On bash shell there is a much simpler way to search through your command history on terminal. Basically you can start typing the initial letter and then use up and down arrow […]






“with” statement in Python to Open a file

A common way to work with files in Python is to create file handler with “open” statement and work with the file. After finishing the work with the file, we need to close the file handler with close statement. For example, if we want to read all lines of a file using Python , we use […]






25 Tips to Move Around in Vim

h Move left j Move down k Move up l Move right w Move to next word W Move to next blank delimited word b Move to the beginning of the word B Move to the beginning of blank delimited word e Move to the end of the word E Move to the end of blank delimited […]






17 Emacs Commands to Get Started

Ctl-a Beginning of line Ctl-e End of line Ctl-k Delete from cursor position to end of line Esc-a Begining of a sentence, if each sentence is eperated by two blanks Esc-e End of a sentence, if each sentence is seperated by two blanks Esc-k Delete from cursor to end of sentence, if each sentence is […]






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 […]






Vim and EMACS Jokes on Twitter

Comparison of Vim, Emacs, Nano https://t.co/LpJlixHWqq pic.twitter.com/bHItWJ6Syn — Unix tool tip (@UnixToolTip) January 8, 2016 The most crucial step to any tutorial: pic.twitter.com/wSaj7gNSQ8 — Kristofer Joseph (@dam) March 19, 2014 I’ve been using Vim for about 2 years now, mostly because I can’t figure out how to exit it. — I Am Devloper (@iamdevloper) February […]