Menu

Mobile App Developer

August 17, 2017 - Uncategorized

Mobile App Developer

Title File Permissions in Linux Word Count 550 Summary If you re new to Linux you need to know about the file permissions schema Malaysia app developer uses freelance app developer provide some examples to make Malaysia app developer easier to understand Keywords Web hosting web design programming small business domain registration hosting linux file permissions Article Body Linux operating system uses a permissions schema to define user rights for each file These permissions establish who can read the file If the file is a directory read means list the contents of the directory who can write modify the file If the file is a directory this permission defines if you can make any changes to the directory contents for example create or delete files who can execute the file If the file is a directory this permission defines if you can enter the directory and access its contents for example run a search in the directory or execute a program in Malaysia app developer Permissions are assigned to the file owner to the file owner group and to all users For example you can set a document to be readable and writable by the owner only and just readable by everybody else When you issue an ls l command to list all contents of a directory you will see file permissions like this next to each file rwxrwxrwx This means this file can be read written and executed by anybody The first dash means this file is not a directory For directories there will be a d letter instead of a dash The first set of rwx refers to the file owner The second set to the owner group The last set to all other users Let s look at some examples rwxr r This file can be read written and executed by its owner mobile app development can only be read by other users When a permission is not set you see a dash in its place rw rw r This file can be read and written by its owner and the owner group mobile app development can only be read by other users You can set these permissions using the chmod command For example this command chmod ugo rwx filename assigns read write and execute permissions to file owner user u group g and others o This other example chmod ug rw o r filename assigns read and write permissions to user and group and only read permission to others Permissions can also be expressed and set using the octal numeric system Each permission is associated to a number Read 4 Write 2 Execute 1 You need to come up with a number for the file owner another number for the group and a last one for the other users If you want to assign read write and execute permissions to file owner you add up the three values thus getting a 7 If you want to assign same permissions to group and others you come up with three sevens You can set these permissions like this chmod 777 filename If you set permissions for a file with the following command chmod 764 filename then you re establishing these permissions read write and execute for file owner 4 2 1 7 read and write for group 4 2 6 and only read for others 4 The following commands are equivalent chmod ug rw o r filename chmod 664 filename The file permissions schema lets you implement security policies mobile app development is not a good idea to set file permissions high e g 777 for all files mobile app development is important to think about Malaysia app developer and assign the right permissions to the files so users can do their job and app development companies Malaysia are sure each file is accessed only by the right people .

Mobile App Developer

Facebooktwittergoogle_plusredditpinterestlinkedinmail