solve the problem that ssh break the while read loop

ssh-break-while-loop.md

Description

ssh break the while loop.

0</dev/null or -n option of ssh can resolve this problem.

Sample Code

#!/bin/bash

cmd="ps -ef | awk '{print \$2}'"

while read node ; do
    pids=$(0</dev/null ssh "root@$node" "$cmd")
	echo "$node" $pids
done

#!/bin/bash

cmd="ps -ef | awk '{print \$2}'"

while read node ; do
	pids=$(ssh -n "root@$node" "$cmd")
	echo "$node" $pids
done

# -n is a more simple and direct way!

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