for server in 10.168.1.1 10.168.1.2; do
ssh "user@$server" /bin/bash -s <<EOF
echo 'testing on $server'
EOF
done
Be aware that using an unquoted heredoc will expand parameters locally. Is why it will expand $server inside single quotes. See difference:
Code:
[mute@geek ~]$ for server in localhost; do
> ssh mute@$server /bin/bash -s <<EOF
> echo 'testing on $server'
> EOF
> done
mute@localhost's password:
testing on localhost
[mute@geek ~]$ for server in localhost; do ssh mute@$server /bin/bash -s <<'EOF'
> echo "testing on $server"
> EOF
> done
mute@localhost's password:
testing on
[mute@geek ~]$
Last edited by neutronscott; 04-17-2012 at 09:45 PM..
Reason: dangling /code tag
Hi,neutronscott
Thanks for your help.
Thus for me to enter the password (password is pass123 for all servers), i just have to add this line right before echo "testing on $server" right?
Code:
for server in 10.168.1.1 10.168.1.2; do
ssh "user@$server" /bin/bash -s <<EOF
pass123
echo 'testing on $server'
EOF
done
Just one last questions, will this harm my servers since i have hundreds of servers to be excecuted ?
Last edited by Scott; 04-19-2012 at 09:33 AM..
Reason: Code tags
You may want to look at a Parallel SSH implementation. Also, one cannot script the password prompt. ssh opens the terminal directly. Ideally you'd setup authorized_keys, or use "expect" (TCL script which acts like a terminal). I'm not well read in these things, sorry.
This User Gave Thanks to neutronscott For This Post:
You may want to look at a Parallel SSH implementation. Also, one cannot script the password prompt. ssh opens the terminal directly. Ideally you'd setup authorized_keys, or use "expect" (TCL script which acts like a terminal). I'm not well read in these things, sorry.
copy content of id_rsa.pub of client into authorized_keys of host
sure..
Be aware that using an unquoted heredoc will expand parameters locally. Is why it will expand $server inside single quotes. See difference:
Code:
[mute@geek ~]$ for server in localhost; do
> ssh mute@$server /bin/bash -s <<EOF
> echo 'testing on $server'
> EOF
> done
mute@localhost's password:
testing on localhost
[mute@geek ~]$ for server in localhost; do ssh mute@$server /bin/bash -s <<'EOF'
> echo "testing on $server"
> EOF
> done
mute@localhost's password:
testing on
[mute@geek ~]$
Hi neutronscott, I could not understand the quoting of here-document stuff that you told.
Also, I read the following about here-documents:
All special characters between here-document, such as $, `, *, ... need to be escaped otherwise the code will be evaluated first by the calling shell
\EOF -- this "here-document", escaped version is used to prevent expansion
Escaping or quoting the delimiter for a here-document instructs the shell not to perform parameter expansion, command/variable substitution and arithmetic expansion on the here-document's contents
so my questions are:
a) what is the difference between \EOF and 'EOF'?
b) what do you mean by expanding locally? As per your example, when I issue ssh command it would be logged into the remote machine after successful password entry. So in that case, it is not in local anymore. So it should have printed the server name right, as I have the quoted the here-document parameter (i.e) 'EOF'?
this will print the variable's value, since it has been escaped. So how it is different from quoting/unquoting of here-doc parameter? Kindly clarify me
Last edited by royalibrahim; 04-19-2012 at 10:49 AM..
as in, $VARIABLE gets substituted before the text gets fed into ssh.
If you're ever in doubt about what will get fed raw into ssh, try
Code:
ssh username@host exec cat <<EOF
...
EOF
To see what the raw, uninterpreted contents of what is received on the other end actually are.
Quote:
As per your example, when I issue ssh command it would be logged into the remote machine after successful password entry. So in that case, it is not in local anymore.
It hardly matters whether it's local "anymore". ssh is not an escape-hatch or shell extension by which your shell script gets funneled raw into something remotely, ssh is just a program like anything else; your own shell must interpret the entire statement first to run it at all.
If you don't want it substituting things which any shell would think deserves substituting, you must prevent it from doing so by various means -- quoting, escaping, the right kind of here-documents, and the like.
Last edited by Corona688; 04-19-2012 at 11:04 AM..
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04-17-2012
