While loop does not return control

Question

The following shell script works only for first server and does not loop to the next. I tried 0< before the ssh command but it still does not return to the shell script once connected.

#!/bin/sh
while read IP
do
ssh root@10.0.0.10 " ssh root@$IP 'ls -lht /log/cdr-csv/ ' " > /tmp/$IP.txt
done << here_doc
18.17.6.19
18.17.10.24
here_doc

How do I run the same command on the second server 18.17.10.24 ?

It seems likely that your SSH connection to the first server is not existing for some reason. Add a `set -x` to the top of your script. Where does it stop? — Zoredache, Oct 09 '14 at 17:04
0< /dev/null ssh root@10.0.0.10 This is the correct answer to this question. Someone from server fault has answered before. I posted this as answer and it was deleted by Moderator who claims to be "system administrator since time out of mind". — shantanuo, Oct 12 '14 at 10:31
@shantanuo: You just posted a line of code without context and it was unclear what you meant. You have used [SF] more than long enough and should know that this is not a proper way to answer, even for your own question. If you would post a proper answer with an explanation, it wouldn't get deleted. — Sven, Oct 13 '14 at 14:25

score 0 · Answer 1 · edited Apr 13 '17 at 12:13

0

You should send to the remote server the script to be executed. The way your script is written will not work because the here_doc is evaluated locally, not remotely.

Take a look on this answer I provided to another user on this subject.

edited Apr 13 '17 at 12:13

Community

1

answered Oct 09 '14 at 17:16

ThoriumBR

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score 0 · Answer 2 · answered Oct 09 '14 at 23:43

0

ssh reads stdin unless you provide the -n option. So, the first IP address is consumed by read IP and all the rest of the here-doc is consumed by ssh root@10.0.0.10. Change that to ssh -n root@10.0.0.10

answered Oct 09 '14 at 23:43

glenn jackman

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While loop does not return control

2 Answers2