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Full Discussion: dynamic variables - eval - expand etc.
Top Forums Shell Programming and Scripting dynamic variables - eval - expand etc. Post 302508065 by TehOne on Friday 25th of March 2011 02:46:35 PM
Old 03-25-2011
Hello,

how do I check whenever a dynamic var exists and how can I compare them in a if statement?

Example:

Code:
counter=0
example=1
until (($counter>2)); do
      if [ ! "$(eval echo "\$testing$example")" ]; then
            echo "FIRST LOOP, CREATING DYN VAR1"
            eval testing$example="test"
      else
            echo "SECOND LOOP, CREATING DYN VAR2"
            eval testing2$example="test"
            echo "SECOND LOOP COMPARING DYN VAR1 to DYN VAR2"
            if [ "$(eval echo \$testing$example)" == "$(eval echo \$testing2$example)" ]; then
                echo "SECOND LOOP MATCH!!!"
                echo "SECOND LOOP CHANGING SECOND DYN VAR TO GET NO MATCH NEXT LOOP"
                eval testing2$example="test2"
            else
                echo "THIRD LOOP NO MATCH!!!"
            fi
      fi
      let counter=counter+1
done

Expected result:

Code:
FIRST LOOP, CREATING DYN VAR1
SECOND LOOP, CREATING DYN VAR2
SECOND LOOP MATCH!!!
SECOND LOOP CHANGING SECOND DYN VAR TO GET NO MATCH NEXT LOOP
THIRD LOOP NO MATCH!!!

Last edited by TehOne; 03-25-2011 at 04:10 PM..
 

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LEARN ABOUT DEBIAN

excel::template::container::conditional

Excel::Template::Container::Conditional(3pm)		User Contributed Perl Documentation	      Excel::Template::Container::Conditional(3pm)

NAME

       Excel::Template::Container::Conditional - Excel::Template::Container::Conditional

PURPOSE

       To provide conditional execution of children nodes

NODE NAME

       IF

INHERITANCE

       CONTAINER

ATTRIBUTES

       o   NAME

	   This is the name of the parameter to test. It is resolved like any other parameter name. (q.v. VAR for more info.)

       o   VALUE

	   If VALUE is set, then a comparison operation is done. The value of NAME is compared to VALUE using the value of OP.

       o   OP

	   If VALUE is set, then this is checked. If it isn't present, then '==' (numeric equality) is assumed. OP must be one of Perl the numeric
	   comparison operators or the string comparison operators. All 6 of each kind is supported.

	   Note: If you want to use < or <=, you must instead use &lt; or &lt;=. This is to make sure it will parse with XML::Parser. You should
	   not need to use &gt; or &gt;= instead of > and >=, respectively.

       o   IS

	   If VALUE is not set, then IS is checked. IS is allowed to be either "TRUE" or "FALSE". The boolean value of NAME is checked against IS.

CHILDREN

       None

EFFECTS

       None

DEPENDENCIES

       None

USAGE

	 <if name="__ODD__" is="false">
	   ... Children here
	 </if>

       In the above example, the children will be executed if the value of __ODD__ (which is set by the LOOP node) is false. So, for all even
       iterations.

AUTHOR

       Rob Kinyon (rob.kinyon@gmail.com)

SEE ALSO

       LOOP, VAR

perl v5.14.2							    2010-06-17			      Excel::Template::Container::Conditional(3pm)
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