background preloader

Bourne-Again shell

Bourne-Again shell
Un article de Wikipédia, l'encyclopédie libre. Bash, acronyme de Bourne-again shell, est le shell du projet GNU. Son nom est un jeu de mots sur le nom du shell historique d'Unix, le Bourne shell. Histoire[modifier | modifier le code] Brian Fox, en 1988, a publié la première implémentation de Bash pour le compte de la Free Software Foundation. Le Bourne shell originel, dont s'inspire Bash, fut écrit par Stephen Bourne en 1977. Usage[modifier | modifier le code] Comme tous les interpréteurs en ligne de commande de type script, Bash exécute quatre opérations fondamentales : Il fournit une liste de commandes permettant d'opérer sur l'ordinateur (lancement de programmes, copie de fichiers, etc.) Les scripts sont de courts programmes généralement faciles à construire. Les scripts peuvent être exécutés manuellement par l'utilisateur ou automatiquement par le système. Fonctionnement[modifier | modifier le code] Bash est un shell qui peut-être utilisé soit en mode interactif, soit en mode batch : Related:  Batch parallelShell

Spring Batch - Parallel Processing Use Case Chunking The messages from a dispatcher to worker processes consist of a chunk of items - a set of items to be processed together in a single transaction (or as the worker sees fit). The dispatcher is usually single threaded, but this is only a restriction based on the input data type (if it is a file it is difficult to read in parallel and maintain restartability). Using a process indicator the dispatcher could be reading from a database table in a multi-threaded model. The main restriction is that for restartability the messages between the dispatcher and workers has to be durable (i.e. The practicalities deserve some discussion. Partitioning The hard thing about this use case is the partitioning of input (and output) sources. Consider two examples: a file input source and a JDBC (SQL query) based input source. File Data Source If each node reads the whole file there could be a performance issue. SQL Data Source Partitioning

1.5 Commandes de bases Next: 1.6 Programme, processus, logiciel & Co [YB] Up: 1. Premiers pas Previous: 1.4 Le Shell.7 [YB] Sous-sections 1.5.1 Format général des commandes [YB] Une fois le système démarré, il attend les ordres que vous voudrez bien lui donner, sous la forme de ce que l'on appelle un prompt. Celui-ci qui peut présenter différentes formes selon les cas, par exemple : [yves@kafka doc]$ _ Dans celui-ci, les informations affichées sont (de gauche à droite) : le nom de l'utilisateur ; le nom de la machine sur laquelle cet utilisateur est connecté ; le répertoire courant. représente un espace frappé au clavier (qui donc n'affiche rien à l'écran) : [yves@kafka doc]$ gzip Rapport.lyx Lettre.txt_ Les espaces sont très importants lorsque vous donnez une commande. -9>> seront interprétés de manière totalement différente par le système sous la forme <<gzip-9>>, sans espace. Par ailleurs, il n'est pas rare que les commandes produisent un résultat à l'écran, c'est-à-dire affichent diverses informations. ls -lisa -l -i

Changing File Permissions Languages: English • Español • 日本語 • Français • Português do Brasil • (Add your language) On computer filesystems, different files and directories have permissions that specify who and what can read, write, modify and access them. This is important because WordPress may need access to write to files in your wp-content directory to enable certain functions. Permission Modes 7 7 7 user group world r+w+x r+x r+x 4+2+1 4+0+1 4+0+1 = 755 The permission mode is computed by adding up the following values for the user, the file group, and for everyone else. Read 4 - Allowed to read files Write 2 - Allowed to write/modify files eXecute1 - Read/write/delete/modify/directory 7 7 7 user group world r+w+x r r 4+2+1 4+1+0 4+1+0 = 744 Example Permission Modes Permission Scheme for WordPress Permissions will be different from host to host, so this guide only details general principles. NOTE: If an experienced user installed WordPress for you, you likely do not need to modify file permissions. About Chmod

Shell Scripts - Learn Linux LINUX CLASSES - PROGRAMMING So how do you run this little wonder of technology? In DOS, all you have to do is name a file with a .bat extension and it'll be recognized as an executable file--but not so with Linux. Since Linux attaches no meaning to file extensions, you have to mark the file as executable by using the chmod command, like this: $ chmod +x deltemp The x marks the file as executable; if you list the permissions for the deltemp file afterward, you will see the x in position four, confirming this: $ ls -l deltemp -rwx------ 1 hermie other 55 Feb 19 14:02 deltemp If you want other users to be able to run this script, give them both read and execute permission, like so: $ chmod ugo+rx deltemp $ ls -l deltemp -rwxr-xr-x 1 hermie other 55 Feb 19 14:04 deltemp Now the permissions show that any user can view or execute the deltemp script, but only you can modify it. $ . Note: If the current directory is in the PATH environment variable, you can omit the ./ before the name. . setvar

PowerShell-Scripting.com - Accueil Learn Enough Command Line to Be Dangerous | Learn Enough Command Line to Be Dangerous | Softcover.io Michael Hartl Learn Enough Command Line to Be Dangerous is an introduction to the command line for complete beginners, the first in a series of tutorials designed to teach the common foundations of “computer magic” (Box 1) to as broad an audience as possible. It is aimed both at those who work with software developers and those who aspire to become developers themselves. Unlike most introductions to the command line, which typically assume a relatively high level of technical sophistication, Learn Enough Command Line to Be Dangerous assumes no prerequisites other than general computer knowledge (how to launch an application, how to use a web browser, how to touch type, etc.). Among other things, this means that it doesn’t assume you know how to use a text editor, or even what a text editor is. Box 1. Computers may be as close as we get to magic in the real world: we type incantations into a machine, and—if the incantations are right—the machine does our bidding. 1 Basics Box 2. Box 3.

CONNAITRE LE TYPE D'UN FICHIER TEXTE BRUT (ANSI, UTF8, UNICODE, UNICODE BIG ENDIAN, RTF) type, fichier, txt, doc, rtf, Source N°34491 Delphi Suite a un probleme d'un membres de Delphi.fr qui ne savais pas comment connaitre le type d'un fichier texte brut, je me suis donc affairé sur cette fonction simple d'un niveau debutant. elle permet de reconnaitre les fichiers texte (.txt) au format Ansi (ascii), UTF8, Unicode et Unicode big endian, RTF et egalement Word Document (peut ne pas fonctionner avec tout les fichiers .Doc). Source / Exemple : Conclusion : Woila, vus la simplicitée de la fonction on pourrait meme ajouter d'autre type de documents qu'ils soit texte brut ou texte formater (RTF, DOC, PDF ect...). Notez bien que certain format comme le unicode ont une signature de seulement 2 octets et pas 3 comme les autres. Ce qui prouve bien qu'il peut etre utile de connaitre le format d'encodage d'un fichier texte meme brut. ps : comme a l'habitude, pas de zip avec ce code si court.

Babel : exécution d'un code parallèle en batch La gestion des travaux sur l'ensemble des noeuds est faite par le système LoadLeveler. Pour pouvoir soumettre, il faut commencer par écrire un script de soumission : c'est l'étape qui est abordée ici. Les commandes de soumission et de suivi de job sont détaillées dans la page commandes de contrôle des travaux batch. Les travaux multi-étapes sont abordé dans cette rubrique et les travaux multi-étapes avec transferts de fichiers avec Gaya sont présentés dans cette page. Voici un exemple de soumission d'un job pour exécuter un code sur 256 coeurs. llsubmit job.ll Le fichier de soumission contient les lignes suivantes : # @ job_name = job_simple # @ job_type = BLUEGENE # Fichier sortie standard du travail # @ output = $(job_name). # Copy output file to submission directory # Warning: if you need to transfer important volumes # of data, please use a multi-step job # $LOADL_STEP_INITDIR is the submission directory cp data.out $LOADL_STEP_INITDIR/ Directives LoadLeveler Script

Linux Tutorial - Learn the Bash Command Line Welcome! Ok, so you want to learn how to use the Bash command line interface (terminal) on Unix/Linux. Or, it's part of a subject you're doing and so you're learning it because you have to. Introduction The following pages are intended to give you a solid foundation in how to use the terminal, to get the computer to do useful work for you. Here you will learn the Linux command line (Bash) with our 13 part beginners tutorial. At first, the Linux command line may seem daunting, complex and scary. Unix likes to take the approach of giving you a set of building blocks and then letting you put them together. A question that may have crossed your mind is "Why should I bother learning the command line? Outline This Linux tutorial is divided into 13 sections. You can now jump into section 1 and get started or keep reading below to learn a little more about this tutorial. The Command Line - What is it, how does it work and how do I get to one. Structure Some general house rules: Obtaining Linux Hi.

jQuery: The Write Less, Do More, JavaScript Library Chapter 7. Scaling and Parallel Processing Chapter 7. Scaling and Parallel Processing Many batch processing problems can be solved with single threaded, single process jobs, so it is always a good idea to properly check if that meets your needs before thinking about more complex implementations. Measure the performance of a realistic job and see if the simplest implementation meets your needs first: you can read and write a file of several hundred megabytes in well under a minute, even with standard hardware. When you are ready to start implementing a job with some parallel processing, Spring Batch offers a range of options, which are described in this chapter, although some features are covered elsewhere. At a high level there are two modes of parallel processing: single process, multi-threaded; and multi-process. Multi-threaded Step (single process)Parallel Steps (single process)Remote Chunking of Step (multi process)Partitioning a Step (single or multi process) <step id="loading"><tasklet task-executor="taskExecutor">... 7.4.3.

How to Use the Linux Command Line: Basics of CLI | The source for Linux information One shell to rule them all, one shell to find them, one shell to bring them all and in the same distro bind them. Command line is one of the many strengths of Linux based systems. Why is it a strength? There is no one answer; there are many answers. I agree that the graphical user interface (GUI) makes it easier for a user to interact with their system and that's what new users may need to get started with Linux; that's what I needed when I was starting off with Linux back in 2005. CLI also allows users to be independent of distros. But once you understand that in Debian-based systems apt-get or dpkg are the commands that you need to manage software, life becomes easy. When I was dependent on a GUI, I used to get worried whether that particular distro has that feature or not - it was all about certain features being exposed or hidden through the GUI. But that's not all command line does. People tend to think command line is difficult; it's not. Get the shell Basics Commands Moving around

Related: