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Full Discussion: Variable within variable expansion
Top Forums Shell Programming and Scripting Variable within variable expansion Post 303044728 by hburnswell on Monday 2nd of March 2020 04:15:37 PM
Old 03-02-2020
Variable within variable expansion
Hi,

I have been trying to get variable within variable expansion to work but have not been able to succeed. It seems that the two suggestions I am seeing are using 'eval' and using the built in bash capability of "${!test}". Here is a snippet of what I"m trying to accomplish:

Code:
#!/bin/bash
b2b_qa_site=1234
b2c_qa_site=4321
b2b_prd_site=5678
b2c_prd_site=8765

grp=`echo "${1: -2:1}"`
env=`echo "${1: -3:1}"`


if [[ $env -eq 4 ]]; then

        env=prd

else

        env=qa

fi

if [[ $grp -eq 0 ]]; then

        grp=b2b

else

        grp=b2c

fi

test=${grp}_${env}_site
eval echo \$test

This would be used as:

Code:
# ./script box400

And ideally receive:

Code:
5678

Can anyone shed some light on what I am doing wrong here? I appreciate any guidance.

Thanks,
HB
 

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LEARN ABOUT FREEBSD

hx509_env_add

hx509 enviroment functions(3)					Heimdalx509library				     hx509 enviroment functions(3)

NAME

       hx509 enviroment functions -

   Functions
       int hx509_env_add (hx509_context context, hx509_env *env, const char *key, const char *value)
       int hx509_env_add_binding (hx509_context context, hx509_env *env, const char *key, hx509_env list)
       const char * hx509_env_lfind (hx509_context context, hx509_env env, const char *key, size_t len)
       const char * hx509_env_find (hx509_context context, hx509_env env, const char *key)
       hx509_env hx509_env_find_binding (hx509_context context, hx509_env env, const char *key)
       void hx509_env_free (hx509_env *env)

Detailed Description
Function Documentation
   int hx509_env_add (hx509_context context, hx509_env * env, const char * key, const char * value)
       Add a new key/value pair to the hx509_env.

       Parameters:
	   context A hx509 context.
	   env enviroment to add the enviroment variable too.
	   key key to add
	   value value to add

       Returns:
	   An hx509 error code, see hx509_get_error_string().

   int hx509_env_add_binding (hx509_context context, hx509_env * env, const char * key, hx509_env list)
       Add a new key/binding pair to the hx509_env.

       Parameters:
	   context A hx509 context.
	   env enviroment to add the enviroment variable too.
	   key key to add
	   list binding list to add

       Returns:
	   An hx509 error code, see hx509_get_error_string().

   const char* hx509_env_find (hx509_context context, hx509_env env, const char * key)
       Search the hx509_env for a key.

       Parameters:
	   context A hx509 context.
	   env enviroment to add the enviroment variable too.
	   key key to search for.

       Returns:
	   the value if the key is found, NULL otherwise.

   hx509_env hx509_env_find_binding (hx509_context context, hx509_env env, const char * key)
       Search the hx509_env for a binding.

       Parameters:
	   context A hx509 context.
	   env enviroment to add the enviroment variable too.
	   key key to search for.

       Returns:
	   the binding if the key is found, NULL if not found.

   void hx509_env_free (hx509_env * env)
       Free an hx509_env enviroment context.

       Parameters:
	   env the enviroment to free.

   const char* hx509_env_lfind (hx509_context context, hx509_env env, const char * key, size_t len)
       Search the hx509_env for a length based key.

       Parameters:
	   context A hx509 context.
	   env enviroment to add the enviroment variable too.
	   key key to search for.
	   len length of key.

       Returns:
	   the value if the key is found, NULL otherwise.

Version 1.5.2							    11 Jan 2012 				     hx509 enviroment functions(3)
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