A user bob attempts to overwrite an existing file named report.txt but receives “Operation not permitted.” The administrator runs:
$ lsattr report.txt
----i--------e--- report.txt
Which action resolves the problem?
setfacl -x u:bob report.txt
chmod u+w report.txt
chattr -i report.txt
chown bob:users report.txt
The i flag in the attribute string marks the file as immutable, preventing changes regardless of permissions, ownership, or ACLs. The chattr -i command removes this flag. Adjusting write bits with chmod, removing ACL entries with setfacl, or changing ownership do not override the immutable attribute.
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