September 2024
Intermediate to advanced
726 pages
16h 30m
Spanish
Content preview from Libro de cocina bash, 2ª edición
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Capítulo 4. Ejecutar comandos
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El objetivo principal de bash (o de cualquier shell) es permitirte interactuar con el sistema operativo del ordenador para que puedas realizar lo que necesites. Normalmente eso implica ejecutar programas, por lo que el intérprete de comandos toma los comandos que escribes, determina a partir de esa entrada qué programas deben ejecutarse y los ejecuta por ti.
Echemos un vistazo al mecanismo básico de lanzamiento de trabajos y exploremos algunas de las funciones que ofrece bash para lanzar programas en primer o segundo plano, secuencialmente o en paralelo, indicar si han tenido éxito, etc.
4.1 Ejecutar cualquier ejecutable
Problema
Necesitas ejecutar un comando en un sistema Linux o Unix.
Solución
Utiliza bash y escribe el nombre del comando en la línea de comandos:
$someprog
Debate
Esto parece bastante sencillo, y en cierto modo lo es, pero pasan muchas cosas entre bastidores que nunca ves. Lo que es importante entender sobre bash es que su funcionamiento básico es cargar y ejecutar programas. Todo lo demás es sólo escaparate para prepararse para ejecutar programas. Claro, hay variables de shell y sentencias de control para hacer bucles y if/then/else bifurcación, y hay formas de controlar la entrada y la salida, pero todo esto es la guinda del pastel de la ejecución de programas.
Entonces, ¿de dónde saca el programa para ejecutarlo? ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.