Since linux is a multi-user operating system, linux implements strict permission division management for all files in the file system. Prevent unauthorized users from accessing a file.
Baidu experience: jingyan.baidu.com
Baidu experience: jingyan.baidu.com
method/step
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The permissions of linux files or directories are divided into three permissions: read, write, and executable. The user categories for file access are divided into three categories: file creator, users in the same group as the file creator, and other users.
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The command to modify file permissions or directories is "chmod 755 test.sh". 755 means "creator has read-write-execute permissions, same group of users and other users have read and execute permissions".
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How is "755" formed: "0" indicates no permission, "1" indicates executable permission, "2" indicates write permission, and "4" indicates read permission. "7=1+2+4, 5=1+4".
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Use the "chmod 777 test.sh" command to use a user who can use the linux system with the same "read, write and execute permissions".
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There is another easy-to-understand way of giving permissions to files or directories in linux. For example: "chmod ax" means that all users will not have execute permission on this file or directory.
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"a" means all users, "u" means the creator, "g" means the creator is in the same group, "o" means other users; "+" means adding permissions, "-" means canceling permissions; "r" means reading Permission, "w" for write permission, "x" for write permission.
