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Top Forums UNIX for Beginners Questions & Answers Assistance with testing ssh connections and what the return codes mean Post 303040365 by greavette on Sunday 27th of October 2019 10:55:23 PM
Old 10-27-2019
Assistance with testing ssh connections and what the return codes mean

Hello Forum,

I'm using a bit of code from a script I found that allows me to capture the status code of connecting via SSH to remote servers:

Code:
ssh -qno StrictHostKeyChecking=no -o ConnectTimeout=1 user@$InputIP 'ls -l /home/user >/dev/null 2>&1' > /dev/null 2>&1

status="$(echo $?)"

echo $status

When I echo out the status codes I can see codes such as the following:

Code:
0 - Success
255 - Error Can't login (not sure why though)
1 - Password Expired

The reasons for each I've gathered from my own experience and from notes in the script I'm using that listed these reasons. But could someone point me to documentation that would help me identify more definitively what the reason codes mean when I connect through SSH and get a return code.

Thank you.
 

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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 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)
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