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Full Discussion: bash: testing if string is a number
Top Forums Shell Programming and Scripting bash: testing if string is a number Post 302080591 by Doc_RuNNeR on Wednesday 19th of July 2006 05:57:48 PM
Old 07-19-2006
Below I write a code with tow output the first one is to numeric arguments and the second if it isnīt numeric
Code:
#!/bin/bash
if echo $1 | grep "^[0-9]*$">aux
then
  echo "La cadena es un valor numerico."
else
  echo "La cadena no es un valor numerico."
fi
rm aux

Enjoy that, and please correct my english Smilie
 

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LEARN ABOUT PHP

dateinterval.format

DATEINTERVAL.FORMAT(3)							 1						    DATEINTERVAL.FORMAT(3)

DateInterval::format - Formats the interval

SYNOPSIS

       public string DateInterval::format (string  $format)

DESCRIPTION

	Formats the interval.

PARAMETERS

	      o $format
		-

	       The following characters are recognized in the $format parameter string. Each format character must be prefixed by a percent sign (
	      %).

	      +------------------+--------------------------------------+---+
	      |$format character |					|   |
	      | 		 |					|   |
	      | 		 |	       Description		|   |
	      | 		 |					|   |
	      | 		 |	      Example values		|   |
	      | 		 |					|   |
	      +------------------+--------------------------------------+---+
	      | 		 |					|   |
	      |        %	 |					|   |
	      | 		 |					|   |
	      | 		 |		Literal %		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		    %			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        Y	 |					|   |
	      | 		 |					|   |
	      | 		 | Years, numeric, at  least  2  digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		  01, 03		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        y	 |					|   |
	      | 		 |					|   |
	      | 		 |	      Years, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		   1, 3 		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        M	 |					|   |
	      | 		 |					|   |
	      | 		 | Months,  numeric,  at least 2 digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 12		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        m	 |					|   |
	      | 		 |					|   |
	      | 		 |	     Months, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 12		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        D	 |					|   |
	      | 		 |					|   |
	      | 		 | Days, numeric,  at  least  2  digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 31		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        d	 |					|   |
	      | 		 |					|   |
	      | 		 |	      Days, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 31		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        a	 |					|   |
	      | 		 |					|   |
	      | 		 | Total  number of days as a result of |   |
	      | 		 | a DateTime::diff or (unknown) other- |   |
	      | 		 | wise 				|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |	       4, 18, 8123		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        H	 |					|   |
	      | 		 |					|   |
	      | 		 | Hours,  numeric,  at  least 2 digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 23		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        h	 |					|   |
	      | 		 |					|   |
	      | 		 |	      Hours, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 23		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        I	 |					|   |
	      | 		 |					|   |
	      | 		 | Minutes, numeric, at least 2  digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 59		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        i	 |					|   |
	      | 		 |					|   |
	      | 		 |	     Minutes, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 59		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        S	 |					|   |
	      | 		 |					|   |
	      | 		 | Seconds,  numeric, at least 2 digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 57		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        s	 |					|   |
	      | 		 |					|   |
	      | 		 |	     Seconds, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 57		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        R	 |					|   |
	      | 		 |					|   |
	      | 		 | Sign " -" when negative, "  +"  when |   |
	      | 		 | positive				|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		   -, + 		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        r	 |					|   |
	      | 		 |					|   |
	      | 		 | Sign  " -" when negative, empty when |   |
	      | 		 | positive				|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		    -,			|   |
	      | 		 |					|   |
	      +------------------+--------------------------------------+---+
RETURN VALUES

	Returns the formatted interval.

NOTES

       Note

	       The DateInterval::format method does not recalculate carry over points in time strings nor  in  date  segments.	This  is  expected
	      because  it is not possible to overflow values like "32 days" which could be interpreted as anything from "1 month and 4 days" to "1
	      month and 1 day".

EXAMPLES

       Example #1

	      DateInterval example

	      <?php

	      $interval = new DateInterval('P2Y4DT6H8M');
	      echo $interval->format('%d days');

	      ?>

	      The above example will output:

	      4 days

       Example #2

	      DateInterval and carry over points

	      <?php

	      $interval = new DateInterval('P32D');
	      echo $interval->format('%d days');

	      ?>

	      The above example will output:

	      32 days

       Example #3

	      DateInterval and DateTime::diff with the %a and %d modifiers

	      <?php

	      $january = new DateTime('2010-01-01');
	      $february = new DateTime('2010-02-01');
	      $interval = $february->diff($january);

	      // %a will output the total number of days.
	      echo $interval->format('%a total days')."
";

	      // While %d will only output the number of days not already covered by the
	      // month.
	      echo $interval->format('%m month, %d days');

	      ?>

	      The above example will output:

	      31 total days
	      1 month, 0 days

SEE ALSO

       DateTime::diff.

PHP Documentation Group 												    DATEINTERVAL.FORMAT(3)
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