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Full Discussion: Unix grep/test command
Top Forums UNIX for Dummies Questions & Answers Unix grep/test command Post 302139682 by netmaster on Monday 8th of October 2007 05:11:47 PM
Old 10-08-2007
Unix grep/test command
Hello, i have a script which checks if the user entered 8 numeric characters in the form of YYYYMMDD (birth date). If the user entered any non numeric characters, an error will be displayed:

Code:

# Check to see if the 8 characters are all numbers
# If not show error essage
# And prompt user for more input

         echo $char | grep -q '^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$'  
if 	[ $? -ne 0 ]
then
         echo "You have entered non-numeric values.  Please type in the form of YYYYMMDD"
	read char
        continue


Is there a simpler way to write this command without using the [0-9] value for each field? Any help would be appreciated
 

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LEARN ABOUT HPUX

yppasswd

yppasswd(1)						      General Commands Manual						       yppasswd(1)

NAME

       yppasswd - change login password in Network Information System (NIS)

SYNOPSIS

       [name]

   Remarks
       The  Network  Information  Service  (NIS)  was  formerly known as Yellow Pages (YP).  The functionality remains the same; only the name has
       changed.

DESCRIPTION

       changes or installs a password associated with the login name in the Network Information System (NIS).  The NIS password can  be  different
       from the one on your own machine.  If name is omitted, it defaults to the name returned by (see getlogin(3C)).

       prompts	for  the old NIS password (even if it does not exist), then twice for the new one.  The old password must be entered correctly for
       the change to take effect.  Checks occur to ensure that the new password meets the following construction requirements.

	      o  Only the first eight characters are significant.

	      o  A password can be as few as four characters long if it contains

		    o  at least one special character or

		    o  a mixture of numeric, uppercase and lowercase letters.

	      o  A password can be as few as five characters long if it contains a mixture of

		    o  uppercase and lowercase letters or

		    o  numeric and either uppercase or lowercase letters.

	      o  A password must contain at least six characters if it contains only monocase letters.

       All these rules except the first are relaxed if you try three times to enter an unacceptable new password.  You cannot,	however,  enter  a
       null password.

       Only the owner of the name or the superuser can change a password.

       The  Network  Information  System  password daemon, must be running on the master NIS password server to change NIS passwords.  See yppass-
       wdd(1M).

WARNINGS

       The password update protocol passes the old and new passwords to the master NIS server at once.	Thus, if the old NIS  password	is  incor-
       rect, no notification is given until the new NIS password is successfully entered.

       The password construction rules are different from those of the HP-UX command (see passwd(1)).

       The  root user's password cannot be changed using or Therefore, root users must change their password in the files database and then recon-
       struct the NIS maps using the command.  For more information on how to use the command, see ypmake(1M).

       User applications that call this routine must be linked with For example,

AUTHOR

       was developed by Sun Microsystems, Inc.

SEE ALSO

       id(1), passwd(1), su(1), yppasswdd(1M), getlogin(3C), yppasswd(3N), ypfiles(4).

																       yppasswd(1)
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