Change existing variable value only user enters non-empty string.

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ypchfn

yppasswd(1)						      General Commands Manual						       yppasswd(1)

NAME

       yppasswd, ypchfn, ypchsh - change your password in the NIS database

SYNOPSIS

       yppasswd [-f] [-l] [-p] [user]
       ypchfn [user]
       ypchsh [user]

DESCRIPTION

       In  the	old  days, the standard passwd(1), chfn(1) and chsh(1) tools could not be used under Linux to change the users NIS password, shell
       and GECOS information. For changing the NIS information, they were replaced by their NIS counterparts, yppasswd, ypchfn and ypchsh.

       Today, this versions are deprecated and should not be used any longer.

       Using the command line switches, you can choose whether to update your password -p, your login shell -l, or your GECOS field -f, or a  com-
       bination of them.  yppasswd implies the -p option, if no other option is given. If you use the -f or -l option, you also need to add the -p
       flag.  ypchfn implies the -f option, and ypchsh -l.

       When invoked without the user argument, the account information for the invoking user will be updated,  otherwise  that	of  user  will	be
       updated. This option is only available to the super-user. If the yppasswdd daemon on the server supports it, you can give the root password
       of the server instead of the users [old] password.

       All tools will first prompt the user for the current NIS password needed for authentication with the yppasswdd(8) daemon. Subsequently, the
       program prompts for the updated information:

       yppasswd or -p
	      Change  the user's NIS password.	  The user is prompted for the new password.  While typing the password, echoing is turned off, so
	      the password does not appear on the screen. An empty password is rejected, as are passwords shorter than six  characters.  The  user
	      will then be requested to retype the password to make sure it wasn't    misspelled the first time.

       ypchsh or -l
	      Change the user's login shell. The user is prompted for a new shell, offering the old one as default:

		Login shell [/bin/sh]: _

	      To  accept  the  default,  simply  press return. To clear the shell field in your passwd(5) file entry (so that the system's default
	      shell is selected), enter the string none.

       ypchfn or -f
	      Change the user's full name and related information. Traditionally, some applications expect  the  GECOS	field  (field  4)  of  the
	      passwd(5) file to contain the user's real name (as opposed to the login name) plus some additional information like the office phone
	      number. This information is displayed by finger(1) and probably some other tools, too.

	      When setting the full name, ypchfn displays the following prompts, with the defaults in brackets:

		Name [Joe Doe]:
		Location [2nd floor, bldg 34]:
		Office Phone [12345]:
		Home Phone []:

	      To accept a default, simply press return. To clear a field, enter the string none.

SEE ALSO

       chfn(1), chsh(1), finger(1), passwd(5), passwd(1), ypcat(1), yppasswdd(8), ypserv(8), ypwhich(1)

AUTHOR

       yppasswd is part of the yp-tools package, which was written by Thorsten Kukuk <kukuk@linux-nis.org>.

YP Tools 2.12							    April 2010							       yppasswd(1)

Shell Programming and Scripting