bash retry function

gistfile1.bash

# Run 10 times at most. 
# % retry 10 echo "xxx" 
#
# Run multiple lines of command in here document.
# % retry 10 <<'_END_'
# echo 1
# echo 2
# _END_
function retry {
  typeset retry_max=$1
  shift

  typeset cmdlst="" i
  if [[ -t 0 ]]; then
    cmdlst="$*"
  else
    read -u 0 -d '' i
    cmdlst="$i"
  fi

  typeset count=$retry_max
  while [[ "$count" -gt 0 ]]; do
    eval "$cmdlst" && break
    count=$(($count - 1))
    sleep 1
  done

  [[ "$count" -eq 0 ]] && {
    echo "Retry failed [$retry_max]: ${cmdlst}" >&2
    return 1;
  }
  return 0
}