File Permissions
chmod:
sudo chmod <who to assign><permissions> <file/folder names>
sudo chmod u+x ./file.txt # assigns the user execute permissions
sudo chmod +x ./file.txt # assigns all users execute permissions
sudo chmod a+x ./file.txt # equivalent
sudo chmod g-x ./file.txt # removes execute permissions for the group
# 'who' codes
o # owner
g # group
u # user
a # all users
# Binary permission codes. Add together to assign.
r = 4 = 100b
w = 2 = 010b
x = 1 = 001bdecimal code
o
o
o
g
g
g
u
u
u
r
w
x
r
w
x
r
w
x
700
1
1
1
0
0
0
0
0
0
600
1
1
0
0
0
0
0
0
0
500
1
0
1
0
0
0
0
0
0
400
1
0
0
0
0
0
0
0
0
300
0
1
1
0
0
0
0
0
0
200
0
1
0
0
0
0
0
0
0
100
0
0
1
0
0
0
0
0
0
000
0
0
0
0
0
0
0
0
0
binary code
decimal code
owner
group
user (all others)
ooo ggg uuu
rwx rwx rwx
100 000 000
400
r--
---
---
010 000 000
200
-w-
---
---
001 000 000
100
--x
---
---
000 100 000
040
---
r--
---
000 010 000
020
---
-w-
---
000 001 000
010
---
--x
---
111 000 000
700
rwx
---
---
110 000 000
600
rw-
---
---
101 000 000
500
r-x
---
---
011 000 000
300
-wx
---
---
111 000 100
704
rwx
---
rw-
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