Hi,
I have the following check to monitor if all ntp servers configured are
alive
*check program ntpq*
* with path /bin/bash -c '/usr/bin/ntpq -4pn |tail -n +3 |awk '"'"'{ print
$3 }'"'"' |grep -q 16'*
* if status = 0 then alert*
I'm using a shell quote escaping extensively to have ' and " in parallel.
Short explanation of multiple single and double quotes:
with path /bin/bash -c '/usr/bin/ntpq -4pn |tail -n +3 |awk '"'"'{ print $3
}'"'"' |grep -q 16'
^^^^^
^^^^^
01234
56789
0. ' - end first quotation which uses single quotes
1. " - start second quotation using double quotes
2. ' - quoted character itself
3. " - end second quotation using double quotes
4. ' - start third quotation using single quotes
5. ' - end third quotation using single quotes
6. " - start fourth quotation using double quotes
7. ' - quoted character itself
8. " - end fourth quotation using double quotes
9. ' - start fifth quotation using single quotes
In fact, shell interprets all above as long concatenated string.
When I run this command in shell all is fine and works as expected - no
output and status code is 1.
When the same check is run by monit, I have the following output:
*# monit status ntpq*
*Monit 5.25.1 uptime: 39d 23h 12m*
*Program 'ntpq'*
* status OK*
* monitoring status Monitored*
* monitoring mode active*
* on reboot start*
* last exit value 1*
* last output Usage: awk [POSIX or GNU style options] -f
progfile [--] file ...*
* Usage: awk [POSIX or GNU style options]
[--] 'program' file ...*
* POSIX options: GNU long options: (standard)*
* -f progfile --file=progfile*
* -F fs --field-separator=fs*
* -v var=val --assign=var=val*
* Short options: GNU long options:
(extensions)*
* -b --characters-as-bytes*
* -c --traditional*
* -C --copyright*
* -d[file] --dump-variables[=file]*
* -D[file] --debug[=file]*
* -e 'program-text' --source='program-text'*
* -E file --exec=file*
* -g --gen-pot*
* -h --help*
* -i includefile --include=includefile*
* -l library --load=library*
* -L[fatal|invalid] --lint[=fatal|invalid]*
* -M --bignum*
* -N --use-lc-numeric*
* -n --non-decimal-data*
* -o[file] --pretty-print[=file]*
* -O --optimize*
* -p[file]*
* data collected Mon, 05 Feb 2018 17:05:56*
I've also tried to quote all expression with double quotes which makes it
even less readable :) with the same result.
Any suggestions on what went wrong would be highly appreciated.
Thanks in advance.
--
Vladimir "vovin" Scherbinin.
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