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Full Discussion: OSX bash & expect
Top Forums Shell Programming and Scripting OSX bash & expect Post 302773761 by DGPickett on Thursday 28th of February 2013 04:21:39 PM
Old 02-28-2013
Have you considered running these things on the root cron or a root service so they can be created with read permission to your id or your user's ids.

I guess tabs are meta to expect, and if they lose their quoting or escaping, they are just white space!

You should be able to send one block of code through, or on the command line of, one ssh session and get all your answers from the output on stdout and stderr.
Code:
echo '...'|ssh whoever@wherever -tt bash 2>&1 | sed '...'
 
ssh whoever@wherever -ntt '...' 2>&1 | while read l ; do ... done

BTW, the first actually becomes bash -c '...' on the remote side for non-trivial '...'

I am not a big fan of the here document '<<' ; there are places it is great, like plain text lists, but for shell it has less control than "echo '...' |ssh bash", where exactly what you say goes down the pipe unprocessed to a remote shell. If you need something on this side that ' blocks, slip out to ", do it , then out of " and back to '. If you want that same control over on the remote shell, ' becomes '"'"' (single-double-single-double-single). No surprises, no extra quote stripping. I try to stay away from '\' for similar reasons. They disappear with little warning.
 

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LEARN ABOUT DEBIAN

molly-guard

MOLLY-GUARD(8)							  [FIXME: manual]						    MOLLY-GUARD(8)

NAME

       molly-guard - guard against accidental shutdowns/reboots

SYNOPSIS

       shutdown [-hV] [--molly-guard-do-nothing] [-- script_options]

       halt [-hV] [--molly-guard-do-nothing] [-- script_options]

       reboot [-hV] [--molly-guard-do-nothing] [-- script_options]

       poweroff [-hV] [--molly-guard-do-nothing] [-- script_options]

DESCRIPTION

       molly-guard attempts to prevent you from accidentally shutting down or rebooting machines. It does this by injecting a couple of checks
       before the existing commands: halt, reboot, shutdown, and poweroff. This happens via scripts with the same names in /usr/sbin, so it only
       works if you have /usr/sbin before /sbin in your PATH!

       Before molly-guard invokes the real command, all scripts in /etc/molly-guard/run.d/ have to run and exit successfully; else, it aborts the
       command.  run-parts(1) is used to process the directory.

       molly-guard passes any script_options to the scripts, and also populates the environment with the following variables:

       o   MOLLYGUARD_CMD - the actual command invoked by the user.

       o   MOLLYGUARD_DO_NOTHING - set to 1 if this is a demo-run.

       o   MOLLYGUARD_SETTINGS - the path to a shell script snippet which scripts can source to obtain settings.

       molly-guard prints the contents of /etc/molly-guard/messages.d/COMMAND or /etc/molly-guard/messages.d/default to the console, if either
       exists. This is due to /etc/molly-guard/run.d/10-print-message.

GUARDING SSH SESSIONS

       molly-guard was primarily designed to shield SSH connections. This functionality (which should arguably be provided by the openssh-server
       package) is implemented in /etc/molly-guard/run.d/30-query-hostname.

       This script first tests whether the command is being executed from a tty which has been created by sshd. It also checks whether the
       variable SSH_CONNECTION is defined. If any of these tests are successful, test script queries the user for the machine's hostname, which
       should be sufficient to prevent the user from doing something by accident.

       You can pass the --pretend-ssh script option to molly-guard to pretend that those tests succeeds. Alternatively, setting
       ALWAYS_QUERY_HOSTNAME in /etc/molly-guard/rc causes the script to always query.

       The following situations are still UNGUARDED. If you can think of ways to protect against those, please let me know!

       o   running sudo within screen or screen within sudo; sudo eats the SSH_CONNECTION variable, and screen creates a new pty.

       o   executing those command in a remote terminal window, that is a XTerm started on a remote machine but displaying on the local X server.

       You have been warned. You can use the --molly-guard-do-nothing switch to prevent anything from happening, e.g.  halt
       --molly-guard-do-nothing.

OPTIONS

       --molly-guard-do-nothing
	   Cause molly-guard to print the command which would be executed, after processing all scripts, instead of executing it.

       -h, --help
	   Display usage information.

       -V, --version
	   Display version information.

SEE ALSO

       shutdown(8), halt(1), reboot(8), poweroff(8).

LEGALESE

       molly-guard is copyright by martin f. krafft. Andrew Ruthven came up with the idea of using the scripts directory and submitted a patch,
       which I modified a bit.

       This manual page was written by martin f. krafft madduck@madduck.net.

       Permission is granted to copy, distribute and/or modify this document under the terms of the Artistic License 2.0

COPYRIGHT

       Copyright (C) 2008 martin f. krafft

[FIXME: source] 						   Apr 19, 2008 						    MOLLY-GUARD(8)
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