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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 SUNOS

factor

factor(1)							   User Commands							 factor(1)

NAME

       factor - obtain the prime factors of a number

SYNOPSIS

       factor [integer]

DESCRIPTION

       factor  writes to standard input all prime factors for any positive integer less than or equal to 10**14. The prime factors are written the
       proper number of times.

       If factor is used without an argument, it waits for an integer to be entered. After entry of the integer, it factors it, writes	its  prime
       factors the proper number of times, and then waits for another integer. factor exits if a 0 or any non-numeric character is entered.

       If factor is invoked with an argument (integer), it writes the integer, factors it and writes all the prime factors as described above, and
       then exits. If the argument is 0 or non-numeric, factor writes a 0 and then exits.

       The maximum time to factor an integer is proportional to sqrt(n), where n is the integer which is entered. factor will take this time  when
       n is prime or the square of a prime.

OPERANDS

       integer	       Any positive integer less than or equal to 10**14.

EXIT STATUS

       0	Successful completion.

       1	An error occurred.

DIAGNOSTICS

       factor prints the error message Ouch! for input out of range or for garbage input.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

SunOS 5.10							    31 Jan 1996 							 factor(1)
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