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Special Forums UNIX and Linux Applications waiting for ssh response for seconds Post 302293482 by vguleria on Tuesday 3rd of March 2009 07:04:12 AM
Old 03-03-2009
Thanks for the solution . It works gr8. Smilie


Quote:
Originally Posted by Gee-Money
Not sure if there is an SSH option for that, however, there is the 'netcat' utility, which you can connect to a certain post, and you can set a timeout.

For instance:

Code:
netcat -z -w <timeout in seconds> <host> <port>

So to check to see if ssh will respond withing 5 seconds, so the following:

Code:
netcat -z -w 5 host.example.com 22 || /bin/some_custom_alert

The '-z' option will make it disconnect as soon as it makes a connection to the port, and of course '-w' is to set the timeout in seconds.

If it does not connect, it will return a non-zero exit status, in which case, you would know to raise your alarm.

Hope this helps...
 

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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 (presumably using a login password, so password authentication should be enabled, unless you've done some clever use of multiple identities) It also changes the permissions of the remote user's home, ~/.ssh, and ~/.ssh/authorized_keys to remove group writability (which would oth- erwise prevent you from logging in, if the remote sshd has StrictModes set in its configuration). 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) SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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