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Check whether a process is alive or not

 
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# 22  
Old 06-01-2007
Quote:
Originally Posted by radoulov
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 ...


Can you please explain what you are trying to do ...i could not able to understand ....various syntax and symbols used....

Response wud be very much appreciated .....
# 23  
Old 06-01-2007
Quote:
Originally Posted by appleforme1415
Can you please explain what you are trying to do ...i could not able to understand ....various syntax and symbols used....
[...]
Code:
lockfile="/tmp/my_lock" 

# define lockfile name, use whatever you want

[ -f "$lockfile" ]&&mypid=$(<"$lockfile") 

# if the lockfile exists 
# set mypid variable to it's content

if ! ps -p $mypid>/dev/null 2>&1;then

# if mypid variable's content is not a pid of a running process ... 

        nohup java -cp ${CLASSPATH} Sample >/dev/null 2>&1 &

# run the java process in nohup

        echo $! >"$lockfile"

# and save its pid in the lockfile 

fi

# 24  
Old 06-05-2007
Thanks very much for interest you took in responding, radoulov
Thanks everybody ...
 
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