check if program running in linux

In shell,we use the below program to check if some program already running:
export HOMEDIR=/../../
export JAVA_HOME=/usr/lib/jvm/java-1.6.0
export LOGFILE=/tmp/log_`date +"%Y%m%d-%H%M%S"`.log
export JAVA_CMD=$JAVA_HOME/bin/java
export CLASSPATH=$JAVA_HOME/lib/tools.jar:$HOMEDIR/lib/ojdbc-14.jar:$HOMEDIR/lib/log4j-1.2.14.jar:$HOMEDIR/lib/commons-logging-1.1.jar
export MAIN_PROGRAM=com.test.theClassEntry
ps -ef | grep "java" > SomeFile
num=$(wc -l SomeFile | awk '{print $1}')
if [ $num -gt 0 ]
then
        echo "the java process is running" > $LOGFILE
        exit 1
else
        nohup $JAVA_CMD -Xmx10g -Dflag=true -classpath "$CLASSPATH" $MAIN_PROGRAM program_parameter > $LOGFILE 2>&1 &
fi

note:
1.-Dproperty=value
Set a system property value.You can call the following from anywhere in the code to read the properties given on the command line:
String value = System.getProperty("key", "defaultvalue");
2.
http://www.linfo.org/ps.html
An alternative set of options for viewing all the processes running on a system is
ps -ef | less
The -e option generates a list of information about every process currently running. The -f option generates a listing that contains fewer items of information for each process than the -l option.
3.
http://www.thegeekstuff.com/2010/01/awk-introduction-tutorial-7-awk-print-examples/
Awk Example  Print only specific field.

Awk has number of built in variables. For each record i.e line, it splits the record delimited by whitespace character by default and stores it in the $n variables. If the line has 4 words, it will be stored in $1, $2, $3 and $4. $0 represents whole line. NF is a built in variable which represents total number of fields in a record.

$ awk '{print $2,$5;}' employee.txt
Thomas $5,000
Jason $5,500
Sanjay $7,000
Nisha $9,500
Randy $6,000

$ awk '{print $2,$NF;}' employee.txt
Thomas $5,000
Jason $5,500
Sanjay $7,000
Nisha $9,500
Randy $6,000
In the above example $2 and $5 represents Name and Salary respectively. We can get the Salary using  $NF also, where $NF represents last field. In the print statement ‘,’ is a concatenator.