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I have the following in a script
for server in ${servers[@]}; do
echo ${server}
ssh user@${server} "for i in /tmp/foo* ; do echo ${i}; done"
done
But it doesn't work. Weird thing, I see $I amount of return lines. So if I have ten files, I see ten blank lines.
Your local shell interpretes the ${i} within double quotes ("), so the command works out to
ssh [email protected] "for i in /tmp/foo* ; do echo; done"
Simply use single quotes (') instead and your problem will disappear:
ssh user@${server} 'for i in /tmp/foo* ; do echo $i; done'
$i disappears because it is called local and not on the server?
Just ran into this problem a bit back, and the solution given, while it does work is not too effective if you're also pulling in variables from the local shell, prior to the ssh you create an array to iterate over. A bit messier somewhat would be to just escape the $ initially so it'd be
"for i in /tmp/foo* ; do echo \${i}; done"
Which would escape it within the local construct, not the called ssh shell.
a=5;server=ip1;ssh user@${server} "echo $a"? Does not work for me
ssh user@${server} "echo \$(hostname) $a" you'd see the hostname of the server you're pointing to not your own. Also if the variables will only live for the life of that one command and you don't want to pollute your shell then a=5 server=ip1 ssh user@${server} "echo \$(hostname) $a would be a solution.
I have updated above answer to get ports from a list too.
for i in {10.21.xxx.yyy,10.21.xxx.yyy,10.23.xxx.yyy};
do
for j in {5501,5502,5503,5504,7701,7702,7703,7704,5551,5552,5553,7771,7772,7773};
do
(echo > /dev/tcp/${i}/${j}) > /dev/null 2>&1 && echo "${i}:${j} :: it's getting connected" || echo "${i}:${j} :: it's not connecting"
done
done
--sshloginoption.