{"id":21,"date":"2020-11-10T13:01:34","date_gmt":"2020-11-10T12:01:34","guid":{"rendered":"http:\/\/horrillo.eu\/?p=21"},"modified":"2021-07-16T10:04:01","modified_gmt":"2021-07-16T09:04:01","slug":"umask","status":"publish","type":"post","link":"https:\/\/horrillo.eu\/?p=21","title":{"rendered":"Permisos y uso del umask"},"content":{"rendered":"\n

A la hora de crear un fichero o directorio en Linux, se nos genera el objeto con unos permisos por defecto, esos permisos se definen con el comando umask<\/strong> . Para ver que umask tenemos asignado en nuestro sistema operativo podemos ejecutar umask<\/strong> a secas.<\/p>\n\n\n\n

[root@sercentos7 ~]# umask
0022<\/p>\n\n\n\n

Si queremos ver que hace este 0022 podemos ejecutar umask -S<\/strong><\/p>\n\n\n\n

[root@sercentos7 ~]# umask -S
u=rwx,g=rx,o=rx<\/p>\n\n\n\n

Podemos observar que con 0022 cuando creamos una carpeta \/ fichero tenemos los permisos de lectura y escritura para el usuario, u=rwx, tenemos los permisos de lectura y ejecuci\u00f3n para el grupo, g=rx, y tenemos lectura y ejecuci\u00f3n para otros, o=rx.<\/p>\n\n\n\n

Por defecto cuando hablamos de ejecuci\u00f3n no estamos indicando que el fichero sea ejecutable, la x es para hacer que el directorio sea ejecutable y podamos acceder a \u00e9l con el comando cd.<\/p>\n\n\n\n

Para calcular el umask tenemos la siguiente tabla:<\/p>\n\n\n\n

\n
Permisos<\/td>FILE<\/td>DIRECTORY<\/td><\/tr>
M\u00e1ximo por defecto<\/td>666<\/td>777<\/td><\/tr>
umask<\/td>0022<\/td>0022<\/td><\/tr>
Default<\/td>644<\/td>755<\/td><\/tr><\/tbody><\/table>
Permisos umask<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n

Los ficheros como m\u00e1ximo tendr\u00e1n 666 y los directorios 777, si tenemos 0022 simplemente hemos de restar.<\/p>\n\n\n\n

666 – 0022 = 644<\/p>\n\n\n\n

Por lo que los ficheros se crear\u00e1n con los permisos u=rw,g=r,o=r y para los directorios<\/p>\n\n\n\n

777 – 0022 = 755<\/p>\n\n\n\n

Se crear\u00e1n con los permisos u=rwx,g=rx,o=rx.<\/p>\n\n\n\n

Para establecer nuestra configuraci\u00f3n por defecto lo tenemos que a\u00f1adir a \/etc\/bashrc (\/etc\/bash.bashrc) \u00f3 \/etc\/profile, en este ultimo fichero, profile, el cambio ser\u00eda para todos los usuarios. Con cualquier editor de ficheros modificamos el fichero ~\/.bashrc si queremos el cambio solo para un usuario o el fichero profile si queremos el cambio para todos los usuarios y a\u00f1adimos la l\u00ednia:<\/p>\n\n\n\n

umask <permisos>.<\/p>\n\n\n\n

Ejemplo:<\/p>\n\n\n\n

umask 0022

Web para calcular que umask necesitas seg\u00fan los permisos que quieras dar.
https:\/\/wintelguy.com\/umask-calc.pl<\/a>

Y tambi\u00e9n por si hace falta aqu\u00ed dejo un enlace hac\u00eda una calculadora binaria.
https:\/\/es.planetcalc.com\/911\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

A la hora de crear un fichero o directorio en Linux, se nos genera el objeto con unos permisos por defecto, esos permisos se definen con el comando umask . Para ver que umask tenemos asignado en nuestro sistema operativo podemos ejecutar umask a secas. [root@sercentos7 ~]# umask0022 Si queremos ver que hace este 0022 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[4,5],"class_list":["post-21","post","type-post","status-publish","format-standard","hentry","category-linux","tag-lpic","tag-umask"],"yoast_head":"\nPermisos y uso del umask - Mi blog<\/title>\n<meta name=\"description\" content=\"Permisos y uso del umask para gestionar nuestros permisos.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/horrillo.eu\/?p=21\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Permisos y uso del umask - Mi blog\" \/>\n<meta property=\"og:description\" content=\"Permisos y uso del umask para gestionar nuestros permisos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/horrillo.eu\/?p=21\" \/>\n<meta property=\"og:site_name\" content=\"Mi blog\" \/>\n<meta property=\"article:published_time\" content=\"2020-11-10T12:01:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-07-16T09:04:01+00:00\" \/>\n<meta name=\"author\" content=\"Juan Antonio Horrillo de Haro\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Juan Antonio Horrillo de Haro\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/horrillo.eu\/?p=21#article\",\"isPartOf\":{\"@id\":\"https:\/\/horrillo.eu\/?p=21\"},\"author\":{\"name\":\"Juan Antonio Horrillo de Haro\",\"@id\":\"https:\/\/horrillo.eu\/#\/schema\/person\/56d9626d9bb38bf236909b6750326bec\"},\"headline\":\"Permisos y uso del umask\",\"datePublished\":\"2020-11-10T12:01:34+00:00\",\"dateModified\":\"2021-07-16T09:04:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/horrillo.eu\/?p=21\"},\"wordCount\":331,\"commentCount\":2,\"keywords\":[\"#lpic\",\"#umask\"],\"articleSection\":[\"Linux\"],\"inLanguage\":\"es\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/horrillo.eu\/?p=21#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/horrillo.eu\/?p=21\",\"url\":\"https:\/\/horrillo.eu\/?p=21\",\"name\":\"Permisos y uso del umask - 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