Gecos field
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The gecos field (also written as GECOS field, standing for General Electric Comprehensive Operating Supervisor) is an entry in the /etc/passwd file on Unix operating systems that is typically used to record general information about the account or its user(s). Exact information depends on the Unix variant, but for example it may contain real name and phone number.
[edit] History
Some early Unix systems at Bell Labs used GECOS machines for print spooling and various other services; in order to accommodate this a field was added to /etc/passwd to carry information for GECOS identity.
