Linux command----chmod

Function: Change the file's ownership rights

chmod [OPTION] ... Mode... FILE ...

u user

Group G

o Other

A All users (default)

+ Add Permissions

-Delete Permissions

= Reassign Permissions

R Read

W Write

X execution

s set user (or group) ID number

T set the sticky bit (sticky bit) to prevent files or directories from being deleted by non-owner

For permission settings, we typically use a 3-bit octal number representation: 4 (Read), 2 (write), 1 (Execute)

You can also set the 4-bit, which is in front of the 3-bit permission sequence, with values of 4, 2, 1

4 Set the user ID at execution time for authorization to a file-based process rather than to the user who created the process

2 Set user group ID at execution time for authorization to processes based on the group of files, rather than on the user who created the process

1 this sticky bit.

Linux command----chmod