incrimental counter

joesto · 06-23-2010, 01:34 AM

hi all
(newboy)
i am just starting a ubuntu server and i am trying to learn
i have a script that runs ever hour and i would like to put a counter
(count=count+)
in a line if it is true
and also if the counter reaches its value of 10 to reset the counter to zero
thanks
joe

konsolebox · 06-23-2010, 01:51 AM

This way perhaps:

Code:

count=0

while sleep 1h; do
    # < run something here >

    (( count = (count + 1) % 10 ))
done

Why reset the counter to 0 by the way?

joesto · 06-23-2010, 07:58 AM

hi thanks for the swift reply
the reason for the count to go to zero is because after 10 counter i restart the pc so i let the script do its part

i have a crontab that run a script ever 2 hours which checks somthing and if it fail the test ten time i do a restart

what does this line mean?(in english ha ha )
while sleep 1h; do

konsolebox · 06-23-2010, 08:31 AM

Quote:

Originally Posted by joesto

what does this line mean?(in english ha ha )
while sleep 1h; do

Here the while compound command will execute/call sleep with the paramater "1h" for every loop. If you look at 'sleep --help', 1h should imply 1 hour. So the sleep command will be running or sleeping itself for 1 hour then when it's done passes the control back to while. If you press ctrl-c while "sleep" is running, a false exit code will return (probably 127 or -127) which will tell 'while' to end the loop.

Helpful commands:

Code:

help while
sleep --help
man sleep
man bash