#compdef exec

[[ $service == exec ]] && precommands+=( exec )

_arguments -s -S -A '-*' : \
  '-a+[set argv\[0\] to specified string]:argv[0] string' \
  '-c[clear environment]' \
  '-l[simulate login shell (prepend - to argv\[0\])]' \
  '*:: : _normal'