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How about one of these two lines:
[ -f /var/chef/cache/cookbooks/bootstrap_cookbooks_version_* ] && echo /var/chef/cache/cookbooks/bootstrap_cookbooks_version_* | sed 's/.*version_//'...

If you know the possible pathnames then you don't need find and grep.
if [ -f /var/chef/cache/cookbooks/bootstrap_cookbooks_version_green ]
then echo "green"
elif [ -f...

Well, then, try
TMP=$(find /where/so/ever -iname "*bootstrap*"); case ${TMP##*_} in (green) echo "is green";; (red) echo "is red";; (*) echo "is missing";; esac


You could, of course, also use...

Do the two file versions coexist, or is there one single file max?
And, why a one liner? What be the benefit thereof?

Try this modification to your code:
INACTIVE_KERNELS=$(python -mplatform | grep -qvi red && echo "Not Red Hat Server" || rpm -qa | grep '^kernel-[0-9]' |grep -vE `uname -r` | paste -sd \; | grep ....

Appending this would test if the returned string is empty, so you could try that:
| grep .


--
The return code of the earlier grep command is nixed by the successful paste command

From my perspective, I don't understand why you do not do all the text processing and system call in python, since your command starts out with python.

python works just fine to process text, make...

Plus, bash creates a subprocess (different from ksh) on the right side of a pipe, meaning any changes to variables in the statement on the right are not returned to the parent. This changed with...

This is the crux of it I think. On the first look at your code I was suspicious that the redirect of stderr on one of the commands was causing you to miss an error causing this. So some nice...

The ssh client exit codes seem to be vary a fair bit between different implementations.

It's unfortunate the the online manual appears to be incorrect or old on your target system. You could...

How about the

lsb_release -a
command?

From man ssh:

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

so:
$ ssh non-existant-user@mymachine
non-existant-user@mymachine:...

Please do not use QUOTE tags for formatting CODE, sample input, output or error message. Only user CODE tags.

Your commands won't work; you need at least e.g. "command substitution".
Try
APP=$(application --version 2>/dev/null || echo "not installed") Be aware that not all applications / tools offer a...

If you append | paste -sd \; to the command then you get them in semi-colon separated fields in one line..

Please provide the results of this command (into code tags) in your reply:

rpm -qa | grep tail -35

... so everyone can see the input data you are working with.

Thanks.

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...

Attention:
ssh -qn is ssh -q -n where -n inhibits reading from stdin - good for ssh -q -n remotehost remotecommand. But it must be ssh -q remotehost < file and ssh -q remotehost << heredoc and ...

You could write a script (local or remote) and execute that, or use "here documents" like

IFS=$'\t' read FLAVOUR HOSTNAME IPADDRESS ACTIVE_KERNEL INACTIVE_KERNEL UPTIME <<- EOFREAD
$(ssh...

If it was me....

I would write a script on the server side to read all the vars you are interested in and store the vars in a JSON file where the filename contains the timestamp, or put the...