Files in Linux cannot be modified by root

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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