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Check whether a process is alive or not

 
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Top Forums UNIX for Dummies Questions & Answers Check whether a process is alive or not
# 15  
Old 05-31-2007
Quote:
Originally Posted by radoulov
Logical OR.



You don't need it when checking $count == 0 ...
Silly me!

I didnt have the patience to think the other way.

The command had a pipe and thought the other two ( '||' ) were also pipes.


Thanks ! Smilie
# 16  
Old 05-31-2007
Quote:
Originally Posted by radoulov
Code:
ps -p $! >&- || echo "not running"

If the above doesn't work use:

Code:
ps -p $! >/dev/null||echo "not running"

Thanks for the reply.

Both command worked partially....

i have intiated a process
Code:
sleep 50 &

then i execute the both commands alternatively , both commands did not get me any outputas the process is alive ...when sleep process finishes, both these commands returned me output
Quote:
[1]+ DONE sleep 50
not running
In the above case ,i need only the output "not running"
can help me on this.....
# 17  
Old 05-31-2007
Quote:
Originally Posted by appleforme1415
Thanks for the reply.

Both command worked partially....

i have intiated a process
Code:
sleep 50 &

then i execute the both commands alternatively , both commands did not get me any outputas the process is alive ...when sleep process finishes, both these commands returned me output


In the above case ,i need only the output "not running"
can help me on this.....
If you run the command interactively disble monitor first

Code:
set +m
...

Within your script you won't get that output.
# 18  
Old 05-31-2007
Quote:
Originally Posted by radoulov
If you run the command interactively disble monitor first

Code:
set +m
...

Within your script you won't get that output.

I am going to run all the commands which i discussed in this forum as a shell script in prod environment.

Wil there be any impact on executing the command "set +m " in Prod environment...

Suppose if i execute the command "set +m" within my shell script it will have its impact only to that shell script ....right ???

Without doing that will there any way to overcome it.....
Kindly advice me on this issue.....
# 19  
Old 05-31-2007
Quote:
Originally Posted by appleforme1415
I am going to run all the commands which i discussed in this forum as a shell script in prod environment.

Wil there be any impact on executing the command "set +m " in Prod environment...
[...]
No.

Quote:
Suppose if i execute the command "set +m" within my shell script it will have its impact only to that shell script ....right ???
Yes, but as already stated, you don't need that command inside a script.
# 20  
Old 05-31-2007
Hammer & Screwdriver
Let me summarize whole thing in a single reply as per the valuable response from the forum members

Code:
CLASSPATH=.
CLASSPATH=${CLASSPATH}:sampleswing.jar
value = $(ps -p $! >&- || echo "not running")

if [ $value == "not running" ] then
 nohup java -cp ${CLASSPATH} Sample > /dev/null 2>&1 &
 echo "kill -9 "$! > killer.sh
 chmod 777 killer.sh
fi


Kindly correct me if there is any mistake in "If construct" syntax....
As i am totally new to Unix, it is bound to happen...
# 21  
Old 05-31-2007
Quote:
Originally Posted by appleforme1415
Let me summarize whole thing in a single reply as per the valuable response from the forum members

Code:
CLASSPATH=.
CLASSPATH=${CLASSPATH}:sampleswing.jar
value = $(ps -p $! >&- || echo "not running")

if [ $value == "not running" ] then
 nohup java -cp ${CLASSPATH} Sample > /dev/null 2>&1 &
 echo "kill -9 "$! > killer.sh
 chmod 777 killer.sh
fi


You cannot use $! before executing the program in background.
You can use something like this:

Code:
lockfile="/tmp/my_lock"

[ -f "$lockfile" ]&&mypid=$(<"$lockfile")
if ! ps -p $mypid>/dev/null 2>&1;then
        nohup java -cp ${CLASSPATH} Sample >/dev/null 2>&1 &
        echo $! >"$lockfile"
fi


Anyway, I'd use some unique pattern from the command line:

Code:
ps -ef|grep [S]ample||nohup java -cp ...

If such a pattern does not exists, I'd create one:
Code:
ps -ef|grep [f]oo||nohup java -Dfoo=foo -cp ...

Last edited by radoulov; 05-31-2007 at 11:12 AM..
 
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