Script that will run a command, time it etc.

kinetik · 06-19-2006, 06:10 PM

Hi again Nix-friends!

I don't know how many questions I've asked here up until now (got answers for most to which I'm eternally greatful), but I've got yet another question:

Say I have a script, called script.sh. This script suffers from a particular problem... sometimes it works, other times it just gets stuck. When it gets stuck I have to do the whole Ctrl+C thing and manually do whatever it is I have to do.

To get around this, I was thinking of composing a new script which will essentially run the script.sh script, time it, then stop it if after xx seconds if it is still running.
Phase 2 will just hold the commands I'll ordinarily run in case of the script.sh script failing.

Now you may ask why don't I just write the darn script with the commands I'd usually use if the script.sh script fails, right? Well, good question! Personally I'd rather would've gone that route too, unfortunately though policy forces me onto the detour...

So, how would I go about this?

Here's what I was thinking:

Quote:

script.sh &
SCRIPTTIME=`ps -efo %c%p%t | grep "script.sh" | sed -n '/grep/!p' | awk {'print $4'}`
SCRIPTPID=`ps -efo %c%p%t | grep "script.sh" | sed -n '/grep/!p' | awk {'print $3'}`

if [ $SCRIPTTIME >= "00:30" ]
then
kill -9 $SCRIPTPID

After the kill thing I'd insert whatever I'd have done when the script.sh script failed. Thing is though, how can I get my script to update the SCRIPTTIME variable every say 2 seconds for 40 seconds?

Thanks in advance

unSpawn · 06-19-2006, 07:49 PM

Why not make a sleep function in the script itself that wakes after n time, determine what the progress is (state file?) and kill/continue? BTW, it probably isn't what functions should be used for, but with encapsulation something like: doSomething() { doSomething --really; || ( logger "script exit at $FUNCNAME"; exit 127 ); }
could provide easier status?

kinetik · 06-19-2006, 08:01 PM

Hi unSpawn!

Thanks for the reply! You especially saved my skin quite a few times! Much appreciated.

As for your suggestions, I'm not really sure how to do that unfortunately. Trying to keep it as simple as possible, or more precisely as easy for me to understand as possible.
The sleep thing seems really attractive to me at this point, though I was looking into:

Quote:

for <something> in SCRIPTTIME; do
if [ $SCRIPTTIME >= "00:30" ]
then
kill -9 $SCRIPTPID

I have no idea how the for statement works though...

unSpawn · 06-19-2006, 08:42 PM

You especially saved my skin quite a few times! Much appreciated.
Thanks. Good to know.

The sleep thing seems really attractive to me at this point
Say you have:
state=/var/run/script.sh_state
bill=$$
killThis() { sleep 300s; if [ "$(cat "$state")" = "FAIL" ]; then logger "Look momma, no hands!"; kill -9 $bill; else killThis; fi; }
so your commands run and if exit != 0 dump it:
command || echo FAIL > "$state"

for <something> in SCRIPTTIME; do
until [ "$SCRIPTTIME" = "00:30" ]; do sleep?

kinetik · 06-19-2006, 09:36 PM

You lost me unSpawn...

It's my own fault though. I'm going to go through some documentation and get myself up to speed first, I'll check back in a bit later.

Thanks for the help so far buddy.

bigearsbilly · 06-20-2006, 08:36 AM

very simple method

Code:

main()
{
    find /
}

main &
sleep 5
kill -9 $!

spirit receiver · 06-20-2006, 09:17 AM

Maybe timeout will do the job, have a look at "man timeout". You can query the exit status afterwards using $? .

kinetik · 06-20-2006, 04:42 PM

Cool, thanks everyone for the help!

I'm going to try this and give feedback in a couple of hours.