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Top Forums UNIX for Beginners Questions & Answers Help understanding what this ls -l command is checking in a script Post 303039572 by greavette on Wednesday 9th of October 2019 07:57:29 PM
Old 10-09-2019
Thanks very much Jim for this quick reply.

This script was created to inventory hundreds of servers I suspect they used the -o command to turn off strict host key checking so the script wouldn't get stuck logging into a new server. I'm adding ssh passwordless to our script and will not need that switch in the future.

Thank you for explaining what this command is doing. is there a list of return codes (non zero) that denote what we couldn't get in? For now 0 being success on logging in and non-zero meaning fail is probably enough for us.

Is there a way to concatenate the two commands to save the result of the first command into the status variable all on one line? I've tried something like:

Code:
ssh -qno StrictHostKeyChecking=no -o ConnectTimeout=1 user@IP 'ls -l /home/opsmgrsvc >/dev/null 2>&1' > /dev/null 2>&1 &&  status="$(echo $?)"

And then I tried using:

Code:
echo $status

to see what was in the variable but it was empty. Am I close in putting this into one line?
 

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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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