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How to resize a picture using command-line tools

Occasionally, I need to resize an image. For instance, Google+ refuses to use my favorite portrait as my profile picture. The reason is that the portrait is smaller than the minimum requirement of 250 x 250 pixels. To scale the image, I can opt for a GUI tool such as GIMP or Pinta. This post explores the scaling of pictures using command-line tools.

How to rename files in bulk

Consider this common scenario. A directory contains multiple files that are named using a common convention: for example, image-001.png, image-002.png, image-003.png, etc. You want to rename the files to, say, upload-001.png, upload-002.png, upload-003.png, etc. The coders among us can write a bash script to automate the process. For expedience, this post shows how to use the built-in rename command to achieve the same goal.

Create slide show from pictures - part 2 (GUI)

Part 1 of this series shows how to create a video or slide show from a set of image files using ffmpeg, a command-line tool. This post describes Imagination, a GUI-based tool, which offers some fancy animation features in slide show creation. To install Imagination on a Debian Linux system:

Create slide show from pictures - part 1

After you upload your pictures from your digital camera to your Linux computer, you want to view them without having to manually open each one. This post explains how to create a slide show from a set of picture files using ffmpeg, a command-line tool. My next post turns to Imagination, a GUI-based tool, to achieve the same goal.

How to automate video screen grabs using ffmpeg

Part 1 of this 2-part series explains how to use VLC, a GUI-based video player, to capture single still frames from a video file. If you are taking many snapshots, you may find the manual VLC method too laborious. This post shows how to automate the capture process using ffmpeg, a command-line tool. Extract frame at a given instant The first scenario is to simply take a single snapshot at a given time instant.

How to capture still frame images from a video clip

I own a point-and-shoot digital camera which also shoots movies. As a novice photographer, I struggle in taking indoor evening pictures. Finally, I resort to first making a movie with the camera, followed by capturing still frames from the movie file. This post is part 1 of a 2-part series to explain the latter. In this post, we go over how to capture, using a GUI tool, a single frame from a movie file.

Find the Fedora/Red Hat package providing a command

My previous post explains, given a Debian or Ubuntu system, how to find the package that provides a command or file. This post covers the same topic but for Fedora or any modern RPM-based system. yum provides Suppose you want to run the mate-system-log command. $ mate-system-log-bash: mate-system-log: command not found

Identify the Debian/Ubuntu package containing a command/filename

Consider this scenario: you read about this excellent Linux command that is new to you. You quickly try it out, and discover that the command is not found. Before you can install the command, you must first find the name of the package that provides it. Below, we outline the instructions to search for a package in Debian/Ubuntu. My next post will do the same for Fedora/Red Hat.

Plot bar charts using gnuplot (part 3/3)

Parts one and two of this series illustrate how to use gnuplot to plot a two-dimensional point graph with time-series data. This post, the third and final of the series, focuses on plotting a bar chart. The raw input data consists of the daily number of page views, and clicks for this blog from 2005 to 2014:

gnuplot explained (part 2/3)

Part 1 of this series presented a gnuplot script to plot the following two-dimensional graph. This post continues the discussion of the commands in the script.

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