[tmux] 端末起動時に自動で新規セッションを作成 or 既存セッションにアタッチ ref: http://qiita.com/ssh0/items/a9956a74bff8254a606a

.zshrc

if [[ ! -n $TMUX && $- == *l* ]]; then
  # get the IDs
  ID="`tmux list-sessions`"
  if [[ -z "$ID" ]]; then
    tmux new-session
  fi
  create_new_session="Create New Session"
  ID="$ID\n${create_new_session}:"
  ID="`echo $ID | $PERCOL | cut -d: -f1`"
  if [[ "$ID" = "${create_new_session}" ]]; then
    tmux new-session
  elif [[ -n "$ID" ]]; then
    tmux attach-session -t "$ID"
  else
    :  # Start terminal normally
  fi
fi

file2.txt

main: 3 windows (created Wed Jan 27 11:49:33 2016) [88x34] (attached)
1: 1 windows (created Wed Jan 27 17:59:17 2016) [213x54]

file6.txt

$ zsh

file7.txt

$ echo $-
569XZghiklms

file8.txt

$ echo $-
569XZghikms