The UNIX chmod command is used to change the execution permissions of a UNIX file. The chmod stands for change mode. The chmod command is based on the permissions and the chmod permissions can be assigned either by number or by a letter value.
| Owner |
Group |
World |
Meaning |
| 7 |
7 |
7 |
Read + Write + execute |
| 6 |
6 |
6 |
Write + execute |
| 5 |
5 |
5 |
Read + execute |
| 4 |
4 |
4 |
read only |
| 2 |
2 |
2 |
write only |
| 1 |
1 |
1 |
Execute only |
| Owner (u) |
Group (g) |
World(o) |
Meaning |
| rwx |
rwx |
rwx |
Read + Write + execute |
| rw |
rw |
rw |
Read + Write |
| rx |
rx |
rx |
Read + execute |
| wx |
wx |
wx |
Write + execute |
| r |
r |
r |
Read only |
| w |
w |
w |
Write Only |
| x |
x |
x |
Execute only |
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