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thomas2004ch 12-02-2013 03:27 AM
[bash Script] Question about usage of $0
 
I have a script (very long) which used to start the Jboss server. What I want is: before the Jboss is started, it does some cleanup job. But as I run the script, it doesn't work. I see the problem is by using the $0 cleanup in the script.

Code:
#!/bin/bash
#
#
# chkconfig: 3 98 02


JBOSS_USER=test
. /home/$JBOSS_USER/.bash_profile

#define where jboss is - this is the directory containing directories log, bin, conf etc
JBOSS_HOME=${JBOSS_HOME:-"/usr/local/jboss"}

#define the user under which jboss will run, or use 'RUNASIS' to run as the current user
JBOSS_USER=${JBOSS_USER:-"jboss"}

#make sure java is in your path
JAVAPTH=${JAVAPTH:-"/usr/local/jdk/bin"}

#configuration to use, usually one of 'minimal', 'default', 'all', 'production'
JBOSS_CONF=${JBOSS_CONF:-"default"}

#if JBOSS_HOST specified, use -b to bind jboss services to that address
JBOSS_BIND_ADDR=${JBOSS_HOST:+"-b $JBOSS_HOST"}

#define the script to use to start jboss
#JBOSSSH=${JBOSSSH:-"$JBOSS_HOME/bin/run.sh -c $JBOSS_CONF $JBOSS_BIND_ADDR" -u $MULTICAST}
JBOSSSH=${JBOSSSH:-"$JBOSS_HOME/bin/run.sh -c $JBOSS_CONF $JBOSS_BIND_ADDR"}

# Clean up cache and save the gc.log, console.log etc.
$0 cleanup

if [ "$JBOSS_USER" = "RUNASIS" ]; then
  SUBIT=""
else
  SUBIT="su - $JBOSS_USER -c "
fi

if [ -n "$JBOSS_CONSOLE" -a ! -d "$JBOSS_CONSOLE" ]; then
  # ensure the file exists
  touch $JBOSS_CONSOLE
  if [ ! -z "$SUBIT" ]; then
    chown $JBOSS_USER $JBOSS_CONSOLE
  fi
fi

if [ -n "$JBOSS_CONSOLE" -a ! -f "$JBOSS_CONSOLE" ]; then
  echo "WARNING: location for saving console log invalid: $JBOSS_CONSOLE"
  echo "WARNING: ignoring it and using /dev/null"
  JBOSS_CONSOLE="/dev/null"
fi

#define what will be done with the console log
#JBOSS_CONSOLE=${JBOSS_CONSOLE:-"/dev/null"}
JBOSS_CONSOLE="/var/log/jboss/$JBOSS_USER/console.log"

JBOSS_CMD_START="cd $JBOSS_HOME/bin; $JBOSSSH"

if [ -z "`echo $PATH | grep $JAVAPTH`" ]; then
  export PATH=$PATH:$JAVAPTH
fi

if [ ! -d "$JBOSS_HOME" ]; then
  echo JBOSS_HOME does not exist as a valid directory : $JBOSS_HOME
  exit 1
fi

echo JBOSS_CMD_START = $JBOSS_CMD_START

function procrunning() {
  procid=0
  JBOSSSCRIPT=$(echo $JBOSSSH | awk '{print $1}' | sed 's/\//\\\//g')
  for procid in `/sbin/pidof -x "$JBOSSSCRIPT"`; do
      ps -fp $procid | grep "${JBOSSSH% *}" > /dev/null && pid=$procid
  done
}


stop() {
    pid=0
    procrunning
    if [ $pid = '0' ]; then
        echo -n -e "\nNo JBossas is currently running\n"
        exit 1
    fi

    RETVAL=1

    # If process is still running

    # First, try to kill it nicely
    for id in `ps --ppid $pid | awk '{print $1}' | grep -v "^PID$"`; do
      if [ -z "$SUBIT" ]; then
          kill -15 $id
      else
          $SUBIT "kill -15 $id"
      fi
    done

    sleep=0
    while [ $sleep -lt 120 -a $RETVAL -eq 1 ]; do
        echo -n -e "\nwaiting for processes to stop";
        sleep 10
        sleep=`expr $sleep + 10`
        pid=0
        procrunning
        if [ $pid == '0' ]; then
            RETVAL=0
        fi
    done

    # Still not dead... kill it

    count=0
    pid=0
    procrunning

    if [ $RETVAL != 0 ] ; then
        echo -e "\nTimeout: Shutdown command was sent, but process is still running with PID $pid"
        exit 1
    fi

    echo
    exit 0
}

cleanup() {
    pid=0
    procrunning
    if [ $pid = '0' ]; then
        echo -n -e "\nNo JBossas is currently running\n"
        exit 1
    else
        echo -n -e "\nJboss is still running. You have to stop the Jboss first.\n"
    fi
}

case "$1" in
start)
    cd $JBOSS_HOME/bin
    if [ -z "$SUBIT" ]; then
        eval $JBOSS_CMD_START >${JBOSS_CONSOLE} 2>&1 &
    else
        $SUBIT "$JBOSS_CMD_START >${JBOSS_CONSOLE} 2>&1 &"
    fi
    ;;
stop)
    stop
    ;;
restart)
    $0 stop
    $0 start
    ;;
cleanup)
    cleanup
    ;;
*)
    echo "usage: $0 (start|stop|restart|help|cleanup)"
esac

druuna 12-02-2013 03:37 AM
This:
Code:
# Clean up cache and save the gc.log, console.log etc.
$0 cleanup
Will call itself with cleanup as input.

Have a look at this simple example:
Code:
#!/bin/bash

echo "\$0 : $0"
echo "\$1 : $1"
echo "\$2 : $2"
Run it:
Code:
$ ./xxx.sh cleanup fubar
$0 : ./xxx.sh
$1 : cleanup
$2 : fubar
It seems that in your code cleanup is a function, which you can run directly:
Code:
#!/bin/bash

cleanup() {
  echo "Do something"
}

cleanup
Code:
$ ./xxx.sh
Do something

thomas2004ch 12-02-2013 03:44 AM
You mean the definition of cleanup() must be before calling it 'cleanup'?

druuna 12-02-2013 03:47 AM
Quote:
Originally Posted by thomas2004ch (Post 5073784)
You mean the definition of cleanup() must be before calling it 'cleanup'?
Yep.
Code:
$ cat xxx.sh
#!/bin/bash

cleanup

cleanup() {
  echo "Do something"
}

$ ./xxx.sh
./xxx.sh: line 3: cleanup: command not found

dive 12-02-2013 07:14 PM
Yes, in bash function defs must come first.


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