linux - M/Monit config file variable expansion -

on debian 8 server have monit 5.9-1 setup , monitoring several services. plan on monitoring atop 1.26-2, can following config

check process atop pidfile /var/run/atop.pid     group system     group atop     start program = "/usr/sbin/service atop start"     stop program  = "/usr/sbin/service atop stop" 

this works fine. have noticed on occasion following entries in /var/log/messages:

traps: atop[8810] trap divide error ip:40780a sp:7ffdf663cdc8 error:0 in atop[400000+26000] 

when happens atop not create daily log file /var/log/atop/atop-$( date '+%y%m%d' ) attempting run atop -r 20160127 -b 15:00 results in output

/var/log/atop/atop_20160127 - open raw file: no such file or directory 

i have been attempting monit check presence of logfile , restart if missing changing above config to

date=$( date '+%y%m%d' ) check process atop pidfile /var/run/atop.pid     group atop     start program = "/usr/sbin/service atop start"     stop program  = "/usr/sbin/service atop stop"     depend on atop_log  check file atop_log path /var/log/atop/atop-$date     group atop 

it not complain bit not expand variable.

anyone have ideas if possible / how this?

the solution i've found use bash script checks presence of file , bash script invoked monit.

create file /etc/monit/scripts/atop-log-check.sh contents:

#!/bin/bash if [ -f "/var/log/atop/atop_$( date '+%y%m%d' )" ];     exit 0 else     exit 1 fi 

chmod 500 update atop monit config to:

check process atop pidfile /var/run/atop.pid     group atop     start program = "/usr/sbin/service atop start"     stop program  = "/usr/sbin/service atop stop"  check file atop-log-check path /etc/monit/scripts/atop-log-check.sh     group atop     if changed checksum alert     if failed permission 500 alert     if failed uid root alert  check program atop_log path /etc/monit/scripts/atop-log-check.sh     group atop     if status != 0 restart