I am polling a file on remote host. I have this code that works, but can't explain why it works.
Code:
while [ -f `ssh user@remote.no-exist.com 'ls /user/app1/.done'` ]
do
echo [INFO] Sleeping for 5 secs
sleep 5;
done
This code works in the way that when the .done file exists on the remote host, the script comes out of the while loop. When the .done is not there, it sleeps for 5 secs and checks again.
Reading the code, it seems like if the file exist on the remote host, the ssh will return the path to the file as output with rc=0, which then should get evaluated on local host for existence of a regular file. That file never exists on the local host. I find it strange that it is working and need help in understanding what is making it work. I am on RHEL 5 x86_64.
Thanks in advance!
Last edited by Franklin52; 10-26-2011 at 03:30 AM..
Reason: Please use code tags, thank you
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LEARN ABOUT DEBIAN
ssh-copy-id
SSH-COPY-ID(1) General Commands Manual SSH-COPY-ID(1)NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys
SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine
DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine and append the indicated identity file to that machine's ~/.ssh/autho-
rized_keys file.
If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your
ssh-agent. Otherwise, if this:
ssh-add -L
provides any output, it uses that in preference to the identity file.
If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin-
gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory,
if necessary.)
NOTES
This program does not modify the permissions of any pre-existing files or directories. Therefore, if the remote sshd has StrictModes set in
its configuration, then the user's home, ~/.ssh folder, and ~/.ssh/authorized_keys file may need to have group writability disabled manu-
ally, e.g. via
chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys
on the remote machine.
SEE ALSO ssh(1), ssh-agent(1), sshd(8)OpenSSH 14 November 1999 SSH-COPY-ID(1)
10-25-2011
