ssh中断while

管理远程服务器时 不可避免的使用while ，但是当在while下执行循环时 ssh会中断 ，用for执行就不会出现这种问题

解决办法有两个

1.用for循环替代 while循环

2. 用while循环时 ，ssh 增加 -n参数

man ssh

-n Redirects stdin from /dev/null (actually, prevents reading from stdin). This must be used when ssh is

run in the background. A common trick is to use this to run X11 programs on a remote machine. For exam-

ple, ssh -n shadows.cs.hut.fi emacs & will start an emacs on shadows.cs.hut.fi, and the X11 connection

will be automatically forwarded over an encrypted channel. The ssh program will be put in the back-

ground. (This does not work if ssh needs to ask for a password or passphrase; see also the -f option.)