1. First execute the following command to check whether the file has been added with the sia attribute;
lsattr /var/spool/cron/root
The results are as follows:
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s---ia------- /var/spool/cron/root
2. Then execute the following command to delete the sia attribute;
chattr -isa /var/spool/cron/root
After deletion, the file can be modified.
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