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Top Forums Shell Programming and Scripting Unix Shell basic loop massive n00b Post 302552089 by thurft on Thursday 1st of September 2011 03:15:56 PM
Old 09-01-2011
Error Unix Shell basic loop massive n00b

hey guys
I would really appreciate some help, i need to do a project for a job that requires minimal UNIX scripting and im REALLY stuck

basically Im stuck at what i believe is something really simple but i just dont have a clue how to do it efficiently and properly and i REALLY appreciate some help

Basically i have a loop at which someone has to enter a string of 3 numbers.

-I want the code to check that the string is numbers only
-check that the numbers have not been already signed to someone else in the users.db file
-restrict the number of numbers to only 3.

- each time the user inputs the number wrong i want it to be allowed to correct and tell why he has to re enter it.

This is the best i could came up with but IM REALLY suck and im at a short UNIX course (1 week) for a job....

Can anyone please tell how do i make the loop properly??

this is the best i could came up with... and i KNOW is crap... but i just dont know best........ I would really appreciate some guidance plz

Code:
#!/bin/bash
echo -e  "Create a new record\n"

fSID (){
read -p "Please enter staff ID: " cSID
}

fSID

gcSID=$(grep $cSID users.db | cut -d ":" -f1 | tr [":"] [" "])
wcSID=$(echo $cSID | wc -c) 

case "$cSID" in
      [!0-9]*         ) echo -e "The staff ID should contain only digits\n "
	  sleep 0.5
	  fSID;;
                  
esac  
    while [ $wcSID -gt 4 ]; do 

  read -p "Please enter a value: " cSID 
wcSID=$(echo $cSID | wc -c) 
echo $wcSID
done 
read -p "u passed to stage 2! gratz" st2


Last edited by pludi; 09-01-2011 at 05:09 PM..
 

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INTVAL(3)								 1								 INTVAL(3)

intval - Get the integer value of a variable

SYNOPSIS
int intval (mixed $var, [int $base = 10]) DESCRIPTION
Returns the integer value of $var, using the specified $base for the conversion (the default is base 10). intval(3) should not be used on objects, as doing so will emit an E_NOTICE level error and return 1. PARAMETERS
o $var - The scalar value being converted to an integer o $base - The base for the conversion Note If $base is 0, the base used is determined by the format of $var: o if string includes a "0x" (or "0X") prefix, the base is taken as 16 (hex); otherwise, o if string starts with "0", the base is taken as 8 (octal); otherwise, o the base is taken as 10 (decimal). RETURN VALUES
The integer value of $var on success, or 0 on failure. Empty arrays return 0, non-empty arrays return 1. The maximum value depends on the system. 32 bit systems have a maximum signed integer range of -2147483648 to 2147483647. So for example on such a system, intval('1000000000000') will return 2147483647. The maximum signed integer value for 64 bit systems is 9223372036854775807. Strings will most likely return 0 although this depends on the leftmost characters of the string. The common rules of integer casting apply. EXAMPLES
Example #1 intval(3) examples The following examples are based on a 32 bit system. <?php echo intval(42); // 42 echo intval(4.2); // 4 echo intval('42'); // 42 echo intval('+42'); // 42 echo intval('-42'); // -42 echo intval(042); // 34 echo intval('042'); // 42 echo intval(1e10); // 1410065408 echo intval('1e10'); // 1 echo intval(0x1A); // 26 echo intval(42000000); // 42000000 echo intval(420000000000000000000); // 0 echo intval('420000000000000000000'); // 2147483647 echo intval(42, 8); // 42 echo intval('42', 8); // 34 echo intval(array()); // 0 echo intval(array('foo', 'bar')); // 1 ?> NOTES
Note The $base parameter has no effect unless the $var parameter is a string. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | Throws E_NOTICE and returns 1, when an object is | | | passed to $var. | | | | +--------+---------------------------------------------------+ SEE ALSO
boolval(3), floatval(3), strval(3), settype(3), is_numeric(3), Type juggling, BCMath Arbitrary Precision Mathematics Functions. PHP Documentation Group INTVAL(3)
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