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Top Forums UNIX for Beginners Questions & Answers Assistance to connect to servers via ssh once and collect various commands into separate variables Post 303039600 by RudiC on Thursday 10th of October 2019 04:09:51 AM
Old 10-10-2019
Thanks, MadeInGermany, for pointing that ssh -n option out. Still, the commands are passed as such (no backtics ``!) to the remote server, so uname -r will be executed remotely.


The script was tested successfully as given in post #4, admittedly on one single server only. The respective variables were correctly filled with the remote info. If something does not work as expected, start over and test stepwise:
- log into the respective remote server(s) and interactively run the commands as given. They should give a one line output each. Multiline output will make the approach fail.
- run the entire ssh command on one server and with one remote command, then with multiple commands, reading results into local variables
- test remote access on all servers, with one command, and then with multiple. If one server (the 50th?) fails, repeat former steps on this one. The error may be due to a remote inconsistency.

- include thorough debuggung / error handling between command (blocks).


I quickly verified the code reading multiple remote servers from a SOURCE_FILE, and it works. echo the remote IP before running the ssh command.
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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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