Shell Programming and Scripting

lets run thru the logic here for better clarity and blackwires benefit
cronjob script "x" kicked off @midnight which does all the good stuff.

There 3 possibilities

1. PopChar has already finished. ( is there a log with a specific date which can be read ? )
2. currently running ( script X takes careof this situation )
3. did not start yet ( look for the log with a specific date exits )

waiting on your input Blackwire,

Cheers,
Sachin Raje.

hi Devaraj,
if i now start the script and the process PopChar isn't running i immediately get the message

start
POPChar is running
it den cycles through the loop POPChar is running

if i start the script and the process PopChar is running it cycles through the loop POPChar is running, that's ok. but if i then stop the process it still cycles
through POPChar is running

Many thanks

Did you grep the right string. I pasted the code as an example

you will need to grep your process name

Code:

if [ `ps -ef | grep -c "sleep"` -gt 0 ]; then

cheers,
Devaraj Takhellambam

hi Devaraj,

yes i changed the process name to PopChar but i still have the same behavior i told you bevor

if i start the script and the process PopChar isn't running i immediately get the message

start
POPChar is running

it den cycles through the loop POPChar is running

if i start the script and the process PopChar is running it cycles through the loop POPChar is running, that's ok. but if i then stop the process it still cycles through POPChar is running.

------------
#!/bin/sh
echo "start"
if [ `ps -ef | grep -c "PopChar"` -gt 0 ];
then
flag=true
else
echo "POPchar is down"
echo "Exiting now"
flag=false
fi
while [ "$flag" = "true" ]
do
if [ `ps -ef | grep -c "PopChar"` -gt 0 ]; then
echo "POPChar is running"
flag=true
sleep 5

hi Sachin,

the logic is (hope you understand what i mean )

a cron job starts a shell script (say "X") once every 24 hours

script "X" takes careof

is process PopChar running ?

if no --> execute shell command x,y,z (the same as below)
then exit

if yes --> loop and test process PopChar until it isn't running
then execute shell command x,y,z (the same as above)
then exit

Many thanks

now it works,
this is the solution.

#!/bin/sh
#
echo "start"
DATE=`date`
#
if [ `ps -ef | grep -c "[P]opChar"` == "1" ];
then
flag=true
else
echo "POPchar is down"
echo "Exiting now"
flag=false
fi
while [ "$flag" = "true" ]
do
if [ `ps -ef | grep -c "[P]opChar"` == "1" ]; then
echo "POPChar is running"
flag=true
sleep 5
else
echo "the POPchar process went down at $DATE"
flag=false
fi
done

Many thanks for your support