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I noticed the following usage here [1]:

sed -i `/%sudo/c %sudo  ALL=(ALL:ALL)  NOPASSWD:ALL` /etc/sudoers
visudo -c

 But I`m puzzled by the `c` that appeared in the `/%sudo/c` part of
the sed command above. Any tips will be helpful.

[1] https://blog.51cto.com/u_4820306/5425575

Regards,
Zhao
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