There are three components of a file permissions
Owner permissions − This determines what actions the owner of the file can perform.
Group permissions − This determines what actions a group member(of the group that a file belongs to) can perform.
Other (world) permissions − This is for everyone else.
$ ls -l /home/sroy8091
-rwxr-xr-- 1 sroy8091 users 1024 Feb 23 00:10 myfile
drwxr-xr--- 1 sroy8091 users 1024 Feb 23 00:10 mydir?
r, w, and x represent read, write and execute respectively.
To change the file permission we need to run chmod command.
$ ls -l testfile
-rwxrwxr-- 1 sroy8091 users 1024 Feb 23 00:10 testfile
$ chmod o+wx testfile
$ ls -l testfile
-rwxrwxrwx 1 sroy8091 users 1024 Feb 23 00:10 testfile?
Here we updated the permission for other users, from only read to read, write and execute.
