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Top Forums UNIX for Beginners Questions & Answers Assistance with testing ssh connections and what the return codes mean Post 303040366 by Chubler_XL on Sunday 27th of October 2019 11:45:45 PM
Old 10-28-2019
From man ssh:

Code:
EXIT STATUS
     ssh exits with the exit status of the remote command or with 255 if an
     error occurred.

so:
Code:
$ ssh non-existant-user@mymachine
non-existant-user@mymachine: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
$ echo $?
255

$ ssh mymachine exit 3
$ echo $?
3

Don't know why you get exit status of 1 when the password has expired - perhaps this is what login returns on target OS when password expired.
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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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