Dropbox/.ssh/の鍵ファイルを全て~/.sshにシンボリックリンクを貼るスクリプトを書いた ref: http://qiita.com/saino-katsutoshi/items/216f594468d0b79bdb54

file0.sh

$ pwd
/path/to/Dropbox/.ssh
$ tree .
.
├── config
├── id_hoge_rsa
├── id_hoge_rsa.pub
└── hoge.pem

file1.sh

$ pwd
/path/to/Dropbox/.ssh
$ touch setup.sh
$ chmod 755 setup.sh
$ vim setup.sh

file3.sh

$ pwd
/path/to/Dropbox/.ssh
$ ./setup.sh

file4.sh

$ cd ~/.ssh
$ ls -la
lrw-r--r--   1 me  staff    42  4 15 18:24 config@ -> /path/to/Dropbox/.ssh/config
$ vim config
Host hogehoge
...(中略)...

setup.sh

#!/bin/sh

files=`find . -maxdepth 1 -type f | sed "s!^.*/!!" | grep -vE "setup.sh|.DS_Store"`

for file in $files; do
  file_path=`pwd`/$file
  target_dir_path=$HOME/.ssh/

  ln -s $file_path $target_dir_path

  target_file_path=$target_dir_path/$file
  if [[ $file =~ '.pem' ]]; then
    chmod -h 400 $target_file_path
  elif [[ $file =~ '.pub' ]]; then
    chmod -h 644 $target_file_path
  elif [[ $file =~ 'config' ]]; then
    chmod -h 644 $target_file_path
  else
    chmod -h 600 $target_file_path
  fi
done