Bash conditional statement wrt time

[redchilis]

Hi,

I'd like to start openvpn at boot only if time is not between 12am to 6am.

I've set system time correctly as per timezone

Thanks

#!/bin/sh

inst=$(grep -m1 -ao '[0-2][0-9]' /dev/urandom | head -n1 | sed 's/^0//;s/00/30/')

/etc/init.d/openvpn start $inst

Code above from here https://forum.openwrt.org/t/crontab-start-random-openvpn-instances/124829

[frollic]

that thread looks pretty complete, what's the actual question ?

[redchilis]

id like to start

/etc/init.d/openvpn start $inst

at boot only if the time is not between 12am to 6am

[frollic]

you only need date +"%H"

How to Get Current Date and Time in Bash/Shell Script - TecAdmin

How to check if the current time is between 23:00 and 06:30

this is obviously only needed if a reboot happens during the on time slot, everything else could be triggered from cron.

@pavelgl is a script guru, and might provide a turn-key ready solution

[redchilis]

Thank you, I think that should do it

#!/bin/sh
currenttime=$(date +%H:%M)
if [[ "$currenttime" > "23:59" ]] || [[ "$currenttime" < "05:59" ]]; then
   echo "rebooted without openvpn" > /dev/kmsg
else
   inst=$(grep -m1 -ao '[0-2][0-9]' /dev/urandom | head -n1 | sed 's/^0//;s/00/30/')
   /etc/init.d/openvpn start $inst
fi

[frollic]

@redchilis

"$currenttime" > "23:59"

time will never be > 23:59, the second check is probably enough.

could skip the %M, and use date +%H, then only check < "06",
if true start VPN, if not .... do noting.

[redchilis]

Thanks, didn't work tho, dunno why

#!/bin/sh
currenttime=$(date +%H)
if [[ "$currenttime" > "24" ]] || [[ "$currenttime" < "06" ]]; then
   echo ">>>>>>>>>>>>>>>>>rebooted without openvpn" > /dev/kmsg
   echo $currenttime > /dev/kmsg
else
   inst=$(grep -m1 -ao '[0-2][0-9]' /dev/urandom | head -n1 | sed 's/^0//;s/00/30/')
   /etc/init.d/openvpn start $inst
   echo ">>>>>>>>>>>>>>>>>rebooted with openvpn" > /dev/kmsg
fi

[  133.431920] >>>>>>>>>>>>>>>>>rebooted without openvpn
[  133.437501] 15

Edit:
I guess I could make it between 1am to 6am to make things easier, thank you though

[frollic]

if [ $currenttime -lt 06 ] should be all you need, since there no hour < 0 (, and > 24).

[redchilis]

That worked, thank you.

Appreciate your help and support.