variable assignment problem

Shell Programming and Scripting
1

hi everyone

pls pls help in the query below
it's urgent
pls

 
 
-bash-3.00$ abc=deepak
-bash-3.00$ a=1
-bash-3.00$ def_${a}=$abc
-bash: def_1=deepak: command not found

y iti is giving error ?

2 
eval def_${a}=$abc

Jean-Pierre.

3

it is still giving error now on displaying the value

-bash-3.00$ abc=deepak
-bash-3.00$ a=1
-bash-3.00$ eval def_${a}=${abc}
-bash-3.00$ echo ${def_${a}}
-bash: ${def_${a}}: bad substitution

---------- Post updated at 03:43 AM ---------- Previous update was at 03:43 AM ----------

it is still giving error now on displaying the value

-bash-3.00$ abc=deepak
-bash-3.00$ a=1
-bash-3.00$ eval def_${a}=${abc}
-bash-3.00$ echo ${def_${a}}
-bash: ${def_${a}}: bad substitution

---------- Post updated at 03:43 AM ---------- Previous update was at 03:43 AM ----------

it is still giving error now on displaying the value

-bash-3.00$ abc=deepak
-bash-3.00$ a=1
-bash-3.00$ eval def_${a}=${abc}
-bash-3.00$ echo ${def_${a}}
-bash: ${def_${a}}: bad substitution
4 
$ abc=deepak
$ a=1
$ eval def_${a}=${abc}

$  eval echo \${def_${a}}
deepak
$

$ vname=def_${a}
$ eval echo \${${vname}}
deepak
$

$ vname=def_${a}
$ echo ${!vname}
deepak
$

Jean-Pierre.