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Posts Tagged ‘cli’

reddit from the terminal

September 7, 2015 Leave a comment

There is a command line interface for Reddit called “rtv” (reddit terminal viewer). It’s written in Python, so you can install it with pip.

Here is a short youtube video on how to use it.

Categories: bash, linux, python Tags: , ,

open a terminal in a specified folder

Problem
From a script I want to launch a terminal that opens in a specified folder.

Solution
Thanks to #linux, I got two solutions:

A1) I use konsole, which has an option for this:

konsole --workdir /tmp

It will open a terminal in the /tmp directory.

A2) Change directory to the specified folder and launch the terminal:

cd /tmp; konsole

If you want to do it from a script, the idea remains the same.

B) If you want to execute a command automatically in the opening terminal, use this:

konsole -e mc

C) Set the title of Konsole to a specified text:

konsole -p tabtitle='NVIM server'

Find more info here.

Categories: bash, linux Tags: , ,

a terminal-based YouTube player

November 2, 2014 Leave a comment

mps-youtube is a terminal-based YouTube player and downloader. If you use YouTube a lot for listening music, then you must give it a try.

Screenshot:

Categories: python Tags: , , ,

Manipulate your PDFs with pdftk

February 21, 2011 Leave a comment

If PDF is electronic paper, then pdftk is an electronic staple-remover, hole-punch, binder, secret-decoder-ring, and X-Ray-glasses. Pdftk is a simple tool for doing everyday things with PDF documents.” (source)

Pdftk is a great command-line tool to manipulate your PDF files.

Installation:

sudo apt-get install pdftk

Examples:
The following examples are taken from here.

Merge Two or More PDFs into a New Document

pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf

or (Using Handles):

pdftk A=1.pdf B=2.pdf cat A B output 12.pdf

or (Using Wildcards):

pdftk *.pdf cat output combined.pdf

Split Select Pages from Multiple PDFs into a New Document

pdftk A=one.pdf B=two.pdf cat A1-7 B1-5 A8 output combined.pdf

Encrypt a PDF using 128-Bit Strength (the Default) and Withhold All Permissions (the Default)

pdftk mydoc.pdf output mydoc.128.pdf owner_pw foopass

Same as Above, Except a Password is Required to Open the PDF

pdftk mydoc.pdf output mydoc.128.pdf owner_pw foo user_pw baz

Same as Above, Except Printing is Allowed (after the PDF is Open)

pdftk mydoc.pdf output mydoc.128.pdf owner_pw foo user_pw baz allow printing

Decrypt a PDF

pdftk secured.pdf input_pw foopass output unsecured.pdf

Join Two Files, One of Which is Encrypted (the Output is Not Encrypted)

pdftk A=secured.pdf mydoc.pdf input_pw A=foopass cat output combined.pdf

Uncompress PDF Page Streams for Editing the PDF Code in a Text Editor

pdftk mydoc.pdf output mydoc.clear.pdf uncompress

Repair a PDF’s Corrupted XREF Table and Stream Lengths (If Possible)

pdftk broken.pdf output fixed.pdf

Burst a Single PDF Document into Single Pages and Report its Data to doc_data.txt

pdftk mydoc.pdf burst

Report on PDF Document Metadata, Bookmarks and Page Labels

pdftk mydoc.pdf dump_data output report.txt

Notes:
pdftk uses the iText Java library (http://itextpdf.sourceforge.net/) to read and write PDF. The author compiled this Java library using GCJ (http://gcc.gnu.org) so it could be linked with a front end written in C++.” (from the man)

Update (20110611)
You can also “explode” a PDF, i.e. split it into a set of individual pages:

pdftk file.pdf burst

Related links

Command line scripting in PHP

February 17, 2011 Leave a comment

When talking about command line scripting, most people think of Python or Perl. But it’s good to know that you can do something similar with PHP too!

Example (hello.php):

#!/usr/bin/php
<?php
   # /etc/php5/cli/php.ini
   # The configuration file for the CLI version of PHP.

   print "Hello, World!\n";
?>

You can execute it with “./hello.php” or “php hello.php“.

Notice that the command line version of PHP uses a different php.ini file.

Consult this page to learn more.

Categories: php Tags:

Command line calculator with Python

February 10, 2011 3 comments

Problem

You use the command line terminal a lot and sometimes you need a simple calculator. Is one available in command line?

Solution

Of course. It’s called Python interpreter :) Python is usually available everywhere and its command line interpreter is a perfect calculator too.

Example:

C:~> python
Python 2.6.6 (r266:84292, Sep 15 2010, 15:52:39) 
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 45 + 98
143
>>> _ + 7
150
>>> _ / 2.0
75.0
>>>

Cannot be any simpler. As you can see, the special variable ‘_‘ (underscore) gets the value of the previous computation. Division between two integers returns the whole part, thus 7 / 2 is 3. What you need is usually 7 / 2.0, which is 3.5.

You can quit with CTRL+D.

Tip

I use this calculator quite often, so I added the following line to my ~/.bashrc:

alias p='python'
Categories: bash, python Tags: ,