whats wrong with my code , [[ $arg == s ]] and case $a in .. not working

[alex xmb ratchev]

once in a while i get over obviously wtf

i try
  for a
 [[ $a == s ]] &&
arr_asign

and
   for a ; do
  case $a
 s)
arr_assign

i tested with args 's' and 'foo'
which should result in apt-cache search foo

but in both cases , [[ and case , the s never gets catched .. it says
apt-cache option s not understood

its like a reverse wonder for me

sa
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