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Chmod Cheatsheet
| Number | Permission | Short | Binary |
| 1 | Execute | x | 001 |
| 2 | Write | w | 010 |
| 3 | Write/Execute | wx | 011 |
| 4 | Read | r | 100 |
| 5 | Read/Execute | rx | 101 |
| 6 | Read/Write | rw | 110 |
| 7 | Read/Write/Execute | rwx | 111 |
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u = user g = group o = other |
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chmod ugo+rwx chmod ugo-rwx chmod 770 chmod 660 |