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For a system Linux is important to know how to use the Shell and its commands as thirst and awk. I'll write a little introduction with examples to help you understand the potential of these commands.

Sed command
sed is a stream editor: working with the data in a serial fashion as they would read a person. Put simply you can think of sed as a way to automatically find and replace words with other. For example, This command replaces all instances of “marco” with “brown” within the text file test.txt:

sed -e 's/marco/bruni/g' prova.txt

Anyone who has used the Regular Expressions in a text editor or programming language will find easy to grasp sed.

The awk command
Awk is a little more difficult and takes longer to learn. And’ a command-oriented record that awk is the right tool to use when the data contains delimited fields that you want to manipulate.

Consider this list of names in a file persone.txt .
Marco Bruni
Mario Rossi
Mark Green
John Blacks

to extract only the name, we can use this command:

awk '{print $1}'Persone.txt Marco Mario Mark John

or we can search only for people named Mark

awk '$ 1 ~ / Marco / {print}'Persone.txt Marco Bruni Marco Verdi

Awk can do much more, and have programming skills as variables, conditionals and loops. But even a basic understanding of how to combine and extract fields will take you far. If you want to go into that I suggest you read this manual: AA Guide Sed and Awk

What do you think?

ls is one of the basic commands of UNIX, and therefore also for GNU / Linux, with it you can monitor directories, files, permits, etc.., its output is detailed and well structured, but it can also be improved.

As?

Try to Execute:

$ (printf "PERMISSIONS LINKS OWNER GROUP SIZE MONTH DAY HH:PA PROGRAM " ; ls-l | sed 1d) | column -t

Related Articles:
http://www.marcobruni.info/it/category/linux
http://www.marcobruni.info/it/category/shell

Often the photos downloaded from digital camera, have the extension. JPG, instead. jpg, to remedy the "problem", just run the following command from the shell:

find /percorso/delle/immagini -name *.JPG -exec rename “s/.JPG/.jpg/g” {} ;

We continue to explore the wonderful world of Gnu/Linux.

Command Today, does is compress the working directory on the fly, showing the progress, and moving in the desired position.

tar-cf – . | p-s $(du-sb . | awk ‘{print $1}’) | gzip > out.tgz

What happens is that tell tar to create "-c", an archive of all files in current directory "." (ricorsivamente), print the output data to stdout "-f -", Then we go to specify the size "-s" all files in current directory, for the command "pv", next step: the "-sb. | awk? (Print $ 1)?"Returns the number of bytes in the current directory, then zip all the content and send the file to the outpup "out.tgz"

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From today I start to publish articles on GNU/Linux which is a free Unix-type operating system and in particular shell is not the armpit but it is a program that allows users to communicate with the system and to start other programs.

Regularly publish these tips to become a good administrator of GNU / Linux

Why not try to unpack a tarball directly from the network, without saving the locally Package?

Let's try:

Using wget enter and run this command: wget-O – http://IndirizzoWeb/a.gz | tar xz
Or Curl enter and run this command: curl http://IndirizzoWeb/a.gz | tar xz

If the archive is compressed using bzip2 "xj" as options to tar, ie tar xj.