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Read (r)Write (w)Execute (x)
Owner (u)
Group (g)
Others (o)
Special
Permission Values
644
rw-r--r--
Binary
110 100 100
Command
chmod 644 filename
What These Permissions Mean
Owner
Group
Others
Common Presets
Permission Reference
Permission Bits
r (4) Read
w (2) Write
x (1) Execute
- (0) No permission
User Classes
u Owner (user)
g Group
o Others
a All (u+g+o)
Special Bits
SUID (4) Run as owner
SGID (2) Run as group
Sticky (1) Restrict delete
chmod Examples
chmod 755 file
chmod u+x file
chmod go-w file
chmod a+r file