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/etc/passwd file

/etc/passwd

The /etc/passwd file is a text file that contains important information about each user in Linux Operating Systems.

Some of this info, is username, UID, GID, shell, home directory, and some other.

From Wikipedia:

The file is named as originally it also contained the data used to verify passwords. However, on modern Unix systems the security-sensitive password information is instead often stored in a different file using shadow passwords.

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Every user can read it, but only root can write it, unless using sudo permissions.

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