Shell Programming and Scripting

hi danmero,

i was using using the grep below as it only returns something if it finds it.

Code:

ps -ef | grep -v grep | grep e_1

The grep below returns the process if it is running as well as the process of grep itself. Therefore this grep will always return something so I can't test if it IS NOT empty.

Code:

ps -ef | grep "ue_21"

When using a simple if statement my grep does work. sorry if i am missing something.

Yes, use the brackets.

Code:

ps -ef | grep "[u]e_21"

Hi, thanks for the feedback. I did note the [] brackets in th grep. Here is what I have now.

When I run this it loops but keeps echoing ue_21 is up even when i stop the ue_21 process. I am checking that it isn't re-starting it as well. The script doesn't get to the echo " test" part. Sorry if this is obvious but I am really scratching my head at this as it looks correct. cheers if anyone has any ideas as to where i am going wrong.

Code:

set DATE=`date +%d%m%y`
set TIME=`date +%H%M`
set RECIPIENT="test@test.co.uk"
set DPID = `ps -ef | grep "[u]e_21"`

while ("$DPID" != "")
     echo "ue_21 is up"
if ($DPID == "") then
     echo " test"
     echo "The ue_21 utility went down at $TIME on $DATE" and was told to restart | mail -s "The ue_2
1 utility went down" $RECIPIENT
endif
sleep 10
end

You have space char's around equal =

hi again. i'm afraid it still doesn't work. I'm thinking it is because it should be;

while (true)

whereas i am doing;

while (not true)
while ("$DPID" != "")

I've done further tests to try and get the expression to work and think it must be to do with the operators.

effectively i need to say whil DPID IS SOMETHING

i have just tried this but it doesn't echo the text in the while script so is not working;
while ("$DPID" =~ "*")

Cheers if anyone can take a look.

i made some changes and it appears to be working now so it may be of help to someone out there;
#!/bin/csh
set DATE=`date +%d%m%y`
set TIME=`date +%H%M`
set RECIPIENT="test@test.co.uk"

while (`ps -ef | grep -c "[u]e_21"` == "1")
echo "ue_21 is up"
sleep 10
if (`ps -ef | grep -c "[u]e_21"` == "0") then
echo "The ue_21 utility went down at $TIME on $DATE" and was told to restart | mail -s "The ue_21 utility went down" $RECIPIENT
endif
end