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i have assigned a /sbin/nologin shell to a user while creating that user (specifying -s option in useradd), if this user logs in using SFTP and changes his .bashrc file, will he be able to change his shell?

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up vote 4 down vote accepted

No, the user can't over-ride /sbin/nologin via .bashrc.

.bashrc is run by the bash shell. nologin doesn't execute it, so modifications to .bashrc should be irrelevant.

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