File Permissions

### FILE PERMISSIONS, OWNERS AND GROUPS ###

"ls -l" example

drw-r--r-- 2 user wheel 4098 Dec 14 05:21 directory1
-rwxr-xr-x 1 user wheel 19271 Dec 16 23:04 file2.sh

(-rwxr-xr-x) (1) (user) (wheel) (19271) (Dec 16 23:04) (file2.sh)

<permissions> <number of hard links> <owner> <group> <file size> <date> <file name>

# permissions
d = directory
rwx  {
    r = read permissions
    w = edit (write) permissions
    x = execute (run) permissions
}

3 groups of rwx
<owner> <group> <other> # respectively
-(rwx)(rwx)(rwx)

#binary and octal
001 = 1
010 = 2
011 = 3
100 = 4
101 = 5
110 = 6
111 = 7

#if 0 = '-'

chmod <octal number> <file> # change permissions of files

ex.
chmod 444 file1
-r--r--r--
(4 = 100 = r--)
# first "-" is directory or other specific type

chmod 664 file1
-rw-rw-r--
# owner and group will be able to read and edit, while everyone else will only be able to read it

chown <name> <file> # change owner of file
chgrp <name> <file> # change group of file