Deny user login by /etc/shadow Default, Linux systems use /etc/shadow to store the encrypted user passwords. The quickest way to block a user is to alter is password stored in /etc/shadow. Normally an active user account will have one line in /etc/shadow that will look like: files:$1$x52JQZle$82KTK0hbzozR3BRuwEWLF.:14970:0:99999:7:::
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