Under what circumstances will chmod fail?I looked at the man page but it only specifies usage and doesn't go into details about what circumstances it won't work in.I'd assume chmod will work if:you're rootyou own the target file (and are setting a mundane mode bit i.e. not sticky bit, others)Can users use chmod to change permissions on a file they have group access for?  Is it related to read/write access?
When does chmod fail?
ubuntu;permissions;chmod;access control