inotify

#!/bin/bash
#ver 1.2 by gavin
#need inotify-tools.x86_64 && inotify-tools-devel.x86_64 package
#yum -y install inotify-tools.x86_64 inotify-tools-devel.x86_64
 
usage_info () {
    echo "Usage: $0 optstring parameters"
    echo "      --verbose       increase verbosity info"
}
 
install_package () {
    echo "need inotify-tools.x86_64 && inotify-tools-devel.x86_64 package"
    echo ""
    echo "rpm --import "
    echo "rpm -Uvh
.i386.rpm"
    echo "rpm -Uvh .
rf.x86_64.rpm"
    echo "yum -y install inotify-tools.x86_64 inotify-tools-devel.x86_64"
    echo ""
}
 
SOR_DIR=/targeting/data
EVENTS=(-e CREATE,MODIFY,MOVED_TO,DELETE)
TARGET_FILE=word_targeting_mobile.db
PID=/tmp/monitor_file.pid
 
monitor_file () {
while inotifywait ${EVENTS[@]} --exclude word_targeting_mobile.db $SOR_DIR; do
    ls -rt $SOR_DIR |grep -v $TARGET_FILE|tail -n1
    ino_file=$SOR_DIR/`ls -rt $SOR_DIR|grep -v $TARGET_FILE |tail -n1`
    echo $ino_file
    echo "get a new file"
    rm -rf $SOR_DIR/$TARGET_FILE
    ln -s $ino_file $SOR_DIR/$TARGET_FILE
    echo "ln -s $ino_file -> $SOR_DIR/$TARGET_FILE"
done
}
 
main () {
[ ! -x /usr/bin/inotifywait ] && install_package
 
[ -e $PID ] && ps -ef |awk '{print $2}' |grep `cat $PID`|grep -v grep &>/dev/null
if [ `echo $?` -eq 0 ]
then
    echo "$0 can not run : process is already running in `cat $PID` pid"
    exit 1
fi
 
if [ $# -eq 0 ]
then
    monitor_file &>/dev/null &
    echo $! > $PID
elif [ "$1" ==  "--verbose" ]
then
    monitor_file 
else
    usage_info
    exit 1
fi
}
 
main $@
 
exit 0