[LINUX] "Chmod" command to set permissions and access permissions for files and folders
Introduction
This time, I will introduce the "chmod" command that sets the permissions and access permissions of files and folders.
How to read file permissions
From the left, the 10 digits of the alphabet are [Details of authority], the part hidden in black is [Owner], and the staff next to it hidden in black is [Owner group].
Regarding [Details of authority], the one character on the left indicates whether it is a file, a directory, or a symbolic link.
The next three characters indicate the owner's access authority, the three characters indicate the group user's access authority, and other user's access authority. R is readable, w is writable, x is executable, and-is no authority. It shows that.
A combination of commands used to change file permissions
Let's change the authority using the ones listed below. Think of it in three parts: [to whom], [grant or delete], and [what authority]. **-Which group should the authority be changed to? **
| symbol | meaning |
|---|---|
| u | Owner authority |
| g | Group permissions |
| o | Privileges of other users |
| a | All permissions |
**-Whether to add or remove permissions **
| symbol | meaning |
|---|---|
| + | Add the authority described later |
| - | Delete the authority described later |
| = | Make it the authority described later |
** ・ What authority to change **
| symbol | meaning |
|---|---|
| r | Read permission |
| w | Write permission |
| x | Execution authority |
Let's change the file permissions
**-Remove read permission for other users **
command
$chmod o-r (file name)
**-Give execute permission to all users **
command
$chmod a+x (file name)
in conclusion
Next time, I'd like to set file and folder permissions and access permissions using numbers in chmod. reference: chmod command Set permissions etc.! Detailed summary of chmod commands
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