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linux - Why are there weird commas in my /etc/passwd file?


There are weird commas after the real-name parameter of some lines in my /etc/passwd file.



kye:x:1000:100:Kye,,,:/home/kye:/bin/bash



What gives? Why are they there? Can I remove them?



Answer



Some tool you used to create the account (adduser?) added them. The tool in question sees the comment / real name field in the passwd file as a GECOS field:


http://en.wikipedia.org/wiki/Gecos_field


The field values are



  1. User's full name (or application name, if the account is for a program)

  2. Building and room number or contact person

  3. Office telephone number

  4. Any other contact information (pager number, fax, etc.)


However, I cannot think of an applicaton which uses them. I believe these fields are close to useless. Use a different tool for adding users (useradd?) or explicitely give a value for the GECOS field if possible.


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