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init script
#!/bin/sh
#
# init script for a Java application
#
# Check the application status
#
# This function checks if the application is running
check_status() {
# Running ps with some arguments to check if the PID exists
# -C : specifies the command name
# -o : determines how columns must be displayed
# h : hides the data header
s=`ps -C 'java -jar /path/to/application.jar' -o pid h`
# If somethig was returned by the ps command, this function returns the PID
if [ $s ] ; then
return $s
fi
# In any another case, return 0
return 0
}
# Starts the application
start() {
# At first checks if the application is already started calling the check_status
# function
check_status
# $? is a special variable that hold the "exit status of the most recently executed
# foreground pipeline"
pid=$?
if [ $pid -ne 0 ] ; then
echo "The application is already started"
exit 1
fi
# If the application isn't running, starts it
echo -n "Starting application: "
# Redirects default and error output to a log file
java -jar /path/to/application.jar >> /path/to/logfile 2>&1 &
echo "OK"
}
# Stops the application
stop() {
# Like as the start function, checks the application status
check_status
pid=$?
if [ $pid -eq 0 ] ; then
echo "Application is already stopped"
exit 1
fi
# Kills the application process
echo -n "Stopping application: "
kill -9 $pid &
echo "OK"
}
# Show the application status
status() {
# The check_status function, again...
check_status
# If the PID was returned means the application is running
if [ $? -ne 0 ] ; then
echo "Application is started"
else
echo "Application is stopped"
fi
}
# Main logic, a simple case to call functions
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status
;;
restart|reload)
stop
start
;;
*)
echo "Usage: $0 {start|stop|restart|reload|status}"
exit 1
esac
exit 0
Source: gustavostraube.wordpress.com
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