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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