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Full Discussion: dynamic variables
Top Forums UNIX for Dummies Questions & Answers dynamic variables Post 302231498 by Franklin52 on Tuesday 2nd of September 2008 12:41:52 PM
Old 09-02-2008
Quote:
Originally Posted by max_payne1234
Can eval be useful here?
eval is useful here and this sample shows how it works:

Code:
#!/bin/sh

var1="hello1"
var2="hello2"
var3="hello3"
counter=1

while [ $counter -le 3 ]
do
  eval "eval_var=\$var${counter}"
  echo ${eval_var}
  let counter=counter+1
done

The backslash before the "$" sign in the eval command is to prevent the shell to expand the variable.

Regards
Last edited by Franklin52; 09-02-2008 at 02:04 PM..
 

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LEARN ABOUT DEBIAN

ost_counter

ost::Counter< T >(3)					     Library Functions Manual					      ost::Counter< T >(3)

NAME

       ost::Counter< T > -

       The counter template is used for generic objects which act as automatic counters.

SYNOPSIS

       #include <counter.h>

   Public Member Functions
       Counter ()
	   Construct and initialize a counter to zero.
       Counter (const Counter &counter)
	   Construct a counter with an initial value set for another counter.
       Counter (T initial)
	   Construct a counter with an initial value of the specified data type.
       T & operator= (T c)
       operator T ()

   Protected Attributes
       T count

Detailed Description
   template<typename T>class ost::Counter< T >
       The counter template is used for generic objects which act as automatic counters.

       Each time the object is accessed, the underlying counted data type is incremented.

       Author:
	   David Sugar dyfet@gnutelephony.org Automatic counter template class.

Constructor &; Destructor Documentation
   template<typename T > ost::Counter< T >::Counter () [inline]
       Construct and initialize a counter to zero.

       References ost::Counter< T >::count.

   template<typename T > ost::Counter< T >::Counter (const Counter< T > &counter) [inline]
       Construct a counter with an initial value set for another counter. Parameters:
	   counter to copy from.

       References ost::Counter< T >::count.

   template<typename T > ost::Counter< T >::Counter (Tinitial) [inline]
       Construct a counter with an initial value of the specified data type. Parameters:
	   initial value to set.

       References ost::Counter< T >::count.

Member Function Documentation
   template<typename T > ost::Counter< T >::operator T () [inline]
       References ost::Counter< T >::count.

   template<typename T > T& ost::Counter< T >::operator= (Tc) [inline]
Member Data Documentation
   template<typename T > T ost::Counter< T >::count [protected]
       Referenced by ost::Counter< T >::Counter(), and ost::Counter< T >::operator T().

Author
       Generated automatically by Doxygen for GNU CommonC++ from the source code.

GNU CommonC++							  Sat Jun 23 2012					      ost::Counter< T >(3)
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