Ετήσια αρχεία: 2016

Fedora/Bash: Get the IP of enp0s3

 στο Bash / GNU/Linux  επισημασμένο με ετικέτα bash / cut / fedora / IP / sed Από

Following is a small snippet that will print on screen the IP of enp0s3 (or any other device if you change the name) while in Fedora.
As you will see, it is not a very sound solution as it depends on the structure of the output of ifconfig enp0s3.

Nevertheless is works (for Fedora at least)! 🙂

ifconfig enp0s3 | grep "inet " | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | cut -d ' ' -f 2

What this line does is: first it prints out the configuration information for enp0s3, then finds the line that contains the inet, then using sed it will trim the result (in other words, it will remove all leading and all trailing white-space from the pipe), finally cut gets the second column of the data after separating the line using the space symbol.

The Fedora version that was used for this tutorial is

$cat /etc/fedora-release 
Fedora release 23 (Twenty Three)

The version of ifconfig for this tutorial is

$ifconfig --version
net-tools 2.10-alpha

In case you want to assign the IP of enp0s3 to a variable, you can easily do as follows

IP=`ifconfig enp0s3 | grep "inet " | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | cut -d ' ' -f 2`;

Ubuntu/Bash: Get the IP of eth0

 στο Bash / GNU/Linux  επισημασμένο με ετικέτα bash / IP / ubuntu Από

Following is a small snippet that will print on screen the IP of eth0 while in Ubuntu (Both server and desktop versions).
As you will see, it is not a very sound solution as it depends on the structure of the output of ifconfig eth0.

Nevertheless is works (for Ubuntu at least)! 🙂

ifconfig eth0 | grep "inet addr" | cut -d ':' -f 2 | cut -d ' ' -f 1

What this line does is: first it prints out the configuration information for eth0, then finds the line that contains the inet addr, using cut it gets the second column of the data after separating the line using the : symbol. Right now in the pipe we will have something similar to this 192.168.1.37 Bcast, so we need to filter out the last part as well. We do the last filtering by using cut again, this time by getting the first column while using the space character as the delimiter.

The Ubuntu version that was used for this tutorial is

$lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.4 LTS
Release:	14.04
Codename:	trusty

The version of ifconfig for this tutorial is

$ifconfig --version
net-tools 1.60
ifconfig 1.42 (2001-04-13)

In case you want to assign the IP of eth0 to a variable, you can easily do as follows

ETH0=`ifconfig eth0 | grep "inet addr" | cut -d ':' -f 2 | cut -d ' ' -f 1`;

Batch convert NEF photos to JPEG using ufraw

 στο Applications  επισημασμένο με ετικέτα Batch / convert / JPEG / NEF / ufraw Από

ufraw converts camera RAW images to standard image files (like jpeg).
Using the ufraw-batch we can massively convert the images in a folder in one call without the need of external scripts to invoke each separate call.

ufraw-batch --out-type=jpeg --out-path=./ ./*.NEF

In the above example we set the output type to jpeg, the folder to write the new images the one we are currently in (./) and the input all NEF files in the current folder.

Batch resize images using ImageMagick

 στο Applications / Bash / GNU/Linux  επισημασμένο με ετικέτα convert / imagemagick / resize Από

The following command will make a shrink copy of all images with the extension jpg in the current folder. The new images will have the 20% of their original size and will have the prefix re_.

for i in $( ls *.jpg ); do convert -resize 20% $i re_$i; done

You need to have ImageMagick installed to get this feature.