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Linux in a Nutshell

This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.

Buy it now, or read it online on Safari Bookshelf.



yppasswdd

rpc.yppasswdd [options]

NFS/NIS command. Server for modifying the NIS password file. yppasswdd handles password-change requests from yppasswd. It changes a password entry only if the password represented by yppasswd matches the encrypted password of that entry and if the user ID and group ID match those in the server's /etc/passwd file. Then it updates /etc/passwd and the password maps on the local server. If the server was compiled with the CHECKROOT=1 option, the password is also checked against the root password.

Options

-D dir

Specify a directory that contains the passwd and shadow files for rpc.yppasswdd to use instead of /etc/passwd and /etc/shadow. Useful to prevent all users in the NIS database from automatically gaining access to the NIS server.

-e chsh|chfn]

Permit users to change the shell or user information in the GECOS field of their passwd entry. By default, rpc.yppasswdd does not permit users to change these fields.

-E program

Specify a program to edit the passwd and shadow files instead of rpc.yppasswdd. The program should return 0 for successful completion; 1 for successful completion, but the pwupdate program should not be run to update the NIS server's maps; and anything else if the change failed.

-p pwfile

Specify an alternative passwd file to /etc/passwd, to prevent all users in the NIS database from automatically gaining access to the NIS server.

--port num

Specify a port that rpc.yppasswdd will try to register itself, allowing a router to filter packets to the NIS ports.

-s shadowfile

Use shadowfile instead of /etc/passwd for shadow password support.

-v

Print version information and whether the package was compiled with CHECKROOT.

-x program

Modify files using the specified program instead of using internal default functions. rpc.yppasswdd passes information to program in the following format:

username o:oldpassword p:password s:shell g:gcos

Any of the fields p, s, or g may be missing.


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