Failed to run scripts in multiple remote host by ssh

Question

I write a deployAll.sh, which read ip_host.list line by line, then add group for all the remote hosts,

when I run: sh deployAll.sh

results:

Gro         


        

Answer 1

Without the ssh command (which wouldn't make sense on my network), I get the expected output so I suspect that the ssh command is swallowing the remaining standard input. You should use the -n flag to prevent ssh from reading from stdin (equivalent to redirecting stdin from /dev/null):

ssh -n "${ipandhost[0]}" "groupadd -g 1011 test"

or

ssh "${ipandhost[0]}" "groupadd -g 1011 test" < /dev/null

See also How to keep script from swallowing all of stdin?